Warning, /education/labplot/ChangeLog is written in an unsupported language. File is not indexed.

0001 -----2.10.0 () -----
0002 New features:
0003         * [worksheet]
0004                 * Bar plots
0005                 * Plot templates - allow to save and re-use custom plot configurations
0006                 * Histogram
0007                         * Error bars (Possion sqrt(N) error or values from custom columns)
0008                         * Rug plots
0009                         * Allow to create a data spreadsheet with the positions and values of the histogram bins
0010                 * Box Plot
0011                         * Rug plots
0012                         * Allow to create a data spreadsheet with the box plot metrics (quartiles, median, etc.)
0013                         * Symbols for whisker end points
0014                         * Allow to modify box properties (color, etc.) for every data set independently of each other
0015                         * Draw a legend item for every dataset in the box plot
0016         * [spreadsheet]
0017                 * Use a different icon for calculated columns, also show the definition of the formula and parameters in the tooltip text in the project explorer
0018                 * Heatmap formatting for categorical data in text columns
0019                 * When generating random numbers, allow to specify the seed number
0020                 * Column statistics for text columns
0021                 * Column statistics for selected cells only
0022                 * Dropping and masking of values also for text and datetime columns
0023                 * Data sampling (random and periodic methods)
0024                 * Data 'flattening' - convert pivoted data to column base format
0025                 * Column statistics (size, mean, stddev, etc.) are available in the function dialog
0026                 * Function values dialog supports accessing arbitrary cells of columns with cell(f(index), g(column,..)) and other moving functions
0027                 * Allow to subtract and add a value by providing a difference between two values
0028                 * Allow to subtract a baseline
0029         * [matrix]
0030                 * Zooming in the image view
0031         * [import]
0032                 * Import data from Excel .xlsx files using QXlsx library
0033                 * HDF5: support VLEN data import
0034                 * Live data: support multiple values via TCP
0035         * [export]
0036                 * Export spreadsheet and matrix in Excel .xlsx format using QXlsx library
0037                 * Use the current working project directory, if available, as the default export path
0038         * [analysis]
0039                 * Maximum Likelyhood estimation for several distributions
0040                 * Guess start values of fit parameter for polynomial models by linear regression
0041                 * Allow to create a spreadsheet with the data steming from the result of the computation
0042                 * Implement fourier filtering for datetimes
0043         * [general]
0044                 * Add settings option for GUM compliant terms
0046 Performance improvements:
0047         * Reduce the memory consumption during the spreadsheet export to Sqlite
0048         * Reduce the memory consumption when importing from a database table into the spreadsheet
0049         * Faster import of files with a big number of columns
0050         * Faster creation of a big number of columns in the spreadsheet
0052 Bug fixes:
0053         * [worksheet]
0054                 * don't crash when undoing the step "add info element".
0055                 * don't crash when changing the error bar types in the curve with no x-column selected yet
0056                 * don't show any context menu in the presenter widget
0057                 * use the full screen size in the dynamic presenter widget for worksheets with "use view size" property set to true
0058                 * allow to zoom the view in the dynamic presenter widget
0059                 * fix using custom value label with invalid data points in xy-curve (BUG 455214)
0060                 * don't crash when deleting a text label that was added after worksheet objects (plots and curves) were created via the plot data dialog (BUG 455096)
0061                 * fix displayed end value of date time plot range
0062                 * fix shifts in date time values due to locale settings (BUG 455579 & 462370)
0063         * [spreadsheet] properly paste the data in the format 'yyyy-MM-dd hh:mm:ss' and similar
0064         * [fit] fix locale usage in evaluation range
0065         * [fit] correctly invalidate fit result when model changes
0066         * [i18n] fix switch language option
0069 -----2.9.0 (03.05.2022) -----
0070         * [general]
0071                 * Allow to copy&paste and to duplicate single objects in the project explorer
0072                 * Allow to change the order of objects in the project explorer (move up and down)
0073                 * Added global settings for numbers
0074                 * Color maps manager allowing the access to multiple collections of color maps
0075                 * Show git hash in about dialog for convenience
0076                 * Use system liborigin when available
0077                 * Open new project per default on startup
0078                 * Examples Dialog - an easy way to browse through all available example projects and to open them directly in the application
0079                 * Allow to save the project without the results of the calculations in the analysis curves to reduce the size of project file
0080                 * Use XZ compression of project files per default with compatibility option for older versions of LabPlot
0081                 * Improve preview resolution of distributions and fit functions
0082                 * Add parser functions to generate non-uniform random numbers of several distributions
0083                 * Fuzzy matching when doing search/filter in the Project Explorer
0084         * [analysis]
0085                 * Support Mathieu functions via GSL
0086                 * Support fitting of any distribution to a histogram
0087                 * Added Hilbert transform including envelope
0088                 * Improve entering ranges for various methods
0089         * [import]
0090                 * Add Option to specify header line in ASCII data
0091                 * Import SAS, Stata and SPSS files using readstat library
0092                 * Import MATLAB MAT files using matio library
0093                 * Import LTspice files
0094                 * HDF5: Select first variable when loading file
0095                 * HDF5: Use data type when importing data
0096                 * HDF5: Preview and import 2d data of strings
0097                 * Improved OPJ project import
0098                 * Improve binary data preview and import data types and speed
0099         * [spreadsheet]:
0100                 * Allow to freeze the first column
0101                 * Search in the spreadsheet
0102                 * Conditional heatmap formatting
0103                 * Support value labels
0104                 * Extended statistics dialog - show additional visualizations (histogram, KDE plot, normal Q-Q plot, BoxPlot)
0105                 * List random number distributions alphabetically
0106         * [worksheet]:
0107                 * Info Element - a new worksheet element to annotate curve values on the plot
0108                 * Image Element - allow to embed the image data and save it in the project file
0109                 * BoxPlot
0110                 * Crosshair cursor mode in the plot
0111                 * New themes "Monokai", "ggplot grey", "ggplot dark", "Tufte"
0112                 * Many more curve symbols
0113                 * Allow to specify text label's position in logical plot coordinates
0114                 * Allow to use a custom column to set the text for the axis ticks
0115                 * Allow to resize the plots on the worksheet with the mouse when no layout is active
0116                 * Plot border type - allow to specify which lines of the plot rectangular to draw (left, top, etc.)
0117                 * Support multiple plot ranges
0118                 * Support real scientific notation and improve all formats of axes tick label
0119                 * Support axes auto tick number and improve range auto scaling
0120                 * Optional showing axis scale and offset in plot
0121                 * Add inverse axis scale
0122                 * Add first tick offset to better place axis ticks
0123                 * Rug plot - visualization where the data points are displayed as marks along the axes
0124                 * Tufte's "range frames" - a new mode in Axis to automatically set the start and end points of the axis to the min and max data points
0125                 * Allow to specify which curves should be shown in the plot legend
0126                 * Switched to Poppler for better LaTeX typesetting support
0127                 * Support background color for label
0129 Bug fixes:
0130         * Fitting: Fix missing locale support in evaluating range of fit function
0131         * Fitting: Fix pseudovoigt model
0132         * Fix crash in convolution and correlation
0133         * Windows: use breeze as default for better dark mode
0134         * Properly save the geometry of visible windows in the project
0135         * Interpolation: avoid crash when x data contains invalid data points or is not strictly increasing
0136         * HDF5: Fix reading attribute strings and better handle strings in compound data
0138 -----2.8.2 (01.04.2021) -----
0139 Bug fixes:
0140         * [CAS]
0141                 * Fixed the regression introduced after the python2 backend was deprecated in Cantor
0142                 * Warn about the potential data looses when a project with CAS content is opened but no CAS support is available
0143         * [worksheet]:
0144                 * DateTime support for Custom Points and for Histograms
0145                 * Fix "power of" notations for negative values, show "0" for zero and improve auto precision for small values for axis labels
0146                 * Show all available symbols styles for CustomPoint, the last one was missing
0147                 * Convert the plot range format to datetime also when the first histogram for datetime data was added to the plot
0148                 * Properly restore the saved values column and also save the values formatting properties in the histogram
0149                 * If the deleted columns are being restored, restore the column pointers also in the histograms
0150                 * Properly react in the histogram when data columns are deleted or renamed
0151                 * Save/load the values format in xy-curve
0152                 * React on text changes for values prefix and suffix and not on return pressed event in the curve properties explorer
0153                 * Fix log scale axis for one tick and ln-scale typo
0154                 * Fix sqrt and square axis scale
0155                 * adjust the range format (numeric vs. datetime) also when the the column of the first curve is changed and not only when a new curve is added
0156                 * simplified the naming of the initial axes for the default plot types (box blot with four axes,  etc.) - use "x" instead of "x axis 1", etc.
0157                 * export to more image formats (jpg, bmp, ppm, xbm, xpm)
0158         * [spreadsheet]
0159                 * show column statistics also for bigint columns
0160                 * when selecting a column in the project explorer, make sure it becomes visible in the spreadsheet by scrolling horizontaly to its position
0161                 * when removing or inserting rows in the spreadsheet, properly update the headers in the spreadsheet
0162         * [import]
0163                 * Don't try to parse a netCDF file when the application was compiled without any support for netCDF, and similar for other formats
0164                 * Show the last recently imported projects in a combobox also in ImportProjectDialog similar to how it's already done in ImportFileDialog
0165                 * Don't show any error messages when the source file or local socket is empty when the import dialog is opened for the first time
0166                 * Fixed ASCII import when start column > 1
0167         * Don't change the current selection in the Project Explorer when objects are being added or removed during undo or redo
0168         * Improved LaTeX support in export dialog and export of big spreadsheets
0169         * BUG 427190 - Fixed resetting parser error count on some platforms (Debian, Manjaro)
0170         * BUG 429110 - Support semicolon as function argument separator for locale with comma as decimal separator
0171         * BUG 429368 - Fix validation of custom model equation in fit dock
0172         * BUG 431535 - Save/Load value format
0173         * BUG 432291 - Show the relevant parts of the drop lines also when the data points are outside of the plot range
0175 -----2.8.1 (13.11.2020) -----
0176         * [worksheet] allow to change the background color for axis labels (default: transparent)
0177         * [worksheet] allow to copy the plot cursor cordinates
0178         * [spreadsheet] better auto-detection of datetime format for values pasted in the spreadsheet
0179         * [live data] allow to add the timestamp column for all network live sources (TCP/UDP), not only for MQTT
0180         * [live data] better error handling and user notifications
0182 Bug fixes:
0183         * Fix compiling with Cantor 20.08.X and X>0
0184         * Fix drawing lines between points of datetime data
0185         * Fix drawing axis tick label in color when in HTML mode
0186         * Fix size of dock widgets when changing between them
0187         * BUG 389920 - remove sub-window shadow remnants when closing the project
0188         * BUG 428029 - changing font of text label for newer Qt versions
0189         * BUG 428813 - full screen not restored (also fixed full screen on macOS)
0190         * BUG 428698 - Don't crash when doing drag&drop between different main windows
0191         * Fix missing settings dialog on macOS
0192         * Parser improvements (found in "Generate Function Values"):
0193                 * Fix Crash using variable name of pre-defined functions as function ("sin()")
0194                 * Allow variable names containing function names ("sina")
0195                 * Correctly remove variables when changing name
0196                 * Use application number locale
0197                 * insert predefined functions with correct number of arguments
0199 -----2.8 (16.09.2020) -----
0200         * Improved DateTime data support
0201         * Show the size of the members in the JSON file in the import file dialog
0202         * [worksheet] In the Export Worksheet Dialog allow to export to the clipboard
0203         * [worksheet] Allow to move plots, text labels and legend with arrow keys
0204         * [worksheet] Image worksheet element
0205         * [worksheet] Reference line on the plot
0206         * [worksheet] Support for imperial units for geometry and size settings of objects
0207         * [worksheet] Improve axes major and minor tick settings
0208         * [spreadsheet] show infinite values as such and not as NaN
0209         * [spreadsheet] support big integer (64 bit) as data type
0210         * [spreadsheet] column normalization methods "divide by max", "divide by min", etc.
0211         * [spreadsheet] Tukey's ladder of powers
0212         * [spreadsheet] added the size of the data set, its mode, 1st and 3rd quartiles and IQR to the column statistics
0213         * [analysis] calculate and expose the rough values as the result of a smooth (data = smooth + rough)
0214         * Allow to open Cantor and Jupyter projects
0215         * [Windows] improved craft blueprint and installer package
0216         * [macOS] added support for touchbar
0217         * Support global user specified decimal separator
0218         * Improved locale support in number input fields
0219         * Extended "About"-Dialog
0221 Bug fixes:
0222         * BUG 421193 - import float(4) data from hdf5
0223         * BUG 418390 - Ignore infinite values (created in CAS worksheets for example) in curves
0224         * BUG 412455 - Don't crash (sporadically) when opening the color scheme menu
0225         * BUG 415214 - Better algorithm to draw the error bar caps
0226         * BUG 413397 - Properly handle removal of columns in the spreadsheet model
0227         * BUG 413401 - In plot data dialog, don't add new worksheets as children to workbooks, use the proper parent aspect
0228         * Fix Cantor support and Unicode characters on Windows
0229         * Fix evaluating fit residuals
0231 -----2.7 (24.10.2019)-----
0232 New features:
0233         * Allow to move objects (drag&drop) to different folders in the project explorer
0234         * [spreadsheet] allow to insert multiple rows and columns in one step
0235         * [spreadsheet] improved the handling of calculated columns (values calculated via a formula):
0236                 * Allow to automatically update the calculated column on data changes in the variable columns
0237                 * Invalidate the calculated column if one of the variable columns was deleted
0238                 * In "Functions Values" dialog highlight the variable column combobox red if the variable column was deleted in the project
0239                 * In "Functions Values" dialog don't allow to select columns to be calculated as variable columns (avoid circular dependencies)
0240                 * In "Used in" context menu of a column show all other calculated columns where this column is used as a variable
0241         * [spreadsheet] when pasting data into empty columns, automatically convert their type to the type of the data to be pasted
0242         * Automatically update curves if a data column deleted before was re-added again (during the import or manually)
0243         * When auto-scaling in the plot take also the error bars into account, if available
0244         * For live data sources allow to save the relative path to the data source
0246 UX improvements:
0247         * in the "Import Data" dialog show the history of the recently imported files
0248         * Improved the selection of curves in the plot that are near to or behind each other
0249         * BUG 408529 - Allow to use DEL to delete cells in spreadsheet and matrix
0250         * BUG 408537 - Allow to insert multiple rows and columns in the spreadsheet in one step
0251         * Added translations to Windows and macOS packages
0252         * Allow to stop the current selection in the plot with ESC
0253         * BUG 410855 - Seed the random number generator with the current time in order not to generate repetitive numbers in the spreadsheet.
0255 Performance:
0256         * Increased the plotting speed for curves with many data points by removing points which are shown on the same pixel in the scene
0258 Bug fixes:
0259         * Disable auto-scale when zooming, otherwise wrong (= auto scaled) data region is shown after project save&open
0260         * [macOS] fix determining number of lines of data files
0261         * Bug 408530 - correctly show error bars for data source columns having NANs
0262         * Bug 407847 - fixed the broken project import
0263         * Bug 411122 - fixed missing option for the resolution of PNG files in the export dialog
0264         * BUG 406805 - support for directory structures in ROOT files
0265         * [data fitting] handle weighted fitting with zero errors correctly
0266         * [data fitting] allow weighted fitting with data source from curve
0267         * [data fitting] fix function for calculating bounded values
0268         * [nsl] fix memory leak in line simplification (Douglas Peuker variant)
0269         * [nsl] fix bug in calculating Bessel polynomials on Windows (used in Bessel filter)
0271 -----2.6 (19.04.2019)-----
0272 New features:
0273         * Histogram
0274         * Import from MQTT sources
0275         * Import of ROOT (CERN) TH1 histograms
0276         * Import of Ngspice raw files (ASCII and binary)
0277         * Import of data in JSON format (JSON arrays and objects)
0278         * Improved import of NetCDF files
0279         * Added file type specific summary and content for special file types in info box of import dialog
0280         * Convolution/Deconvolution of data sets (sampling interval, linear/circular, normalization, wrap, standard kernel)
0281         * Cross-/Autocorrelation of data sets (sampling interval, linear/circular, normalization)
0282         * Allow to specify the number format when exporting spreadsheet and matrix
0283         * Improved user interface for data fitting (add fit function preview, show parameters directly, make options foldable)
0284         * [spreadsheet] when filling a float column with row numbers, automatically convert its type to integer
0285         * [spreadsheet] when filling an integer column with function values, automatically convert its type to float
0286         * [spreadsheet] data manipulation: add/subtract/multiply/divide for column values
0287         * [spreadsheet] export to SQLite
0288         * [matrix] data manipulation: add/subtract/multiply/divide for matrix values
0289         * [worksheet] Allow to specify different border shapes for labels (rectangle, eclipse, etc.)
0290         * [worksheet] Allow to rotate plot legends
0291         * [worksheet] Better positioning of rotated axis tick labels
0292         * [worksheet] Allow to make plots not-interactive (ignore mouse drag and wheel events) to avoid unwanted occasional panning and zooming
0293         * Allow to connect to SQL databases via ODBC
0294         * Show the amount of consumed memory in the status bar (optional)
0295         * Allow to change the settings for different computer algebra systems (Maxima, etc.) directly in LabPlot (embedd Cantor's settings widgets)
0297 Bug fixes:
0298         * Fixed several problems in live data support
0299         * [spreadsheet] properly calculate function values out of integer x-values
0300         * [matrix] fix editing integer values
0301         * [import] fix preview update and add missing close of netcdf files
0302         * Don't crash when a scaling factor equal to zero was set for axis
0304 -----2.5 (21.06.2018)-----
0305 New features:
0306         * Support for reading and plotting of live-data
0307         * Improved data fitting
0308                 * Automatically guess parameter of custom models
0309                 * Better result presentation
0310                 * Support different weight types
0311                 * Consider given x- and y-error when fitting (can be switched off)
0312                 * Show t statistics, P > |t| and confidence interval
0313                 * Calculate p-value for chi-square and F test in nonlinear fitting
0314                 * added fit models for most statistical distributions
0315         * Improved theming
0316                 * Apply themes to worksheet and to all its children
0317                 * Respect theme settings also in plot legends and labels
0318                 * Allow to disable theming in worksheets and plots after a theme was selected
0319                 * Show currently active theme in the "Apply theme" button
0320                 * New application option in the settings for the default theme used for new worksheets.
0321         * Support different data types
0322                 * auto detect integer and datetime data in import
0323                 * support number locale and datetime formats
0324                 * improved data type support in spreadsheets
0325         * Import from SQL databases (tables or custom queries)
0326         * Import Origin OPJ projects
0327         * Much better support for Windows and macOS
0328         * Syntax highlighting for LaTeX in the text label
0329         * Allow to set the background color for LaTeX labels
0330         * Support Hermite polynomials from GSL 2.4
0331         * Support error functions and related functions from libcerf
0332         * "Used in" sub-menu in column contex menu for faster navigation to the curves consuming the column
0333         * Direct application of analysis functions (smoothing, interpolating, etc.) on the ploted data via curve's context menu
0334         * Direct application of analysis functions  on the data in the spreadsheet and plotting of the results via spreadsheet's context menu
0335         * Drag columns in the project explorer and drop them on plots (either in a worksheet view or in the project explorer) to create curves
0336         * "Show last N points" and "Show first N points" data ranges in cartesian plot
0337         * Added CLI option --presenter to start LabPlot directly in the presenter mode
0338         * Added CLI parameter to directly open project files (LabPlot or Origin)
0339         * Allow drag&drop of projects files (LabPlot and Origin) on the main window to load the project
0340         * Allow drag&drop of data files on the main window to import the data
0341         * Show tooltips for the supported mathematical functions and constants in the expression text field
0342         * Automatically switch to the scientific representation for numbers bigger than 10^4 on the axis tick labels
0343         * Automatically allow the latex typesetting in the application after the latex environment was installed later without making the user to go to the settings dialog
0344         * Allow to change the color scheme for the application
0345         * Smooth and animated zooming in the worksheet view
0346         * Allow to add text labels to plots
0347         * Improved building with MSVC, Intel and PGI compiler
0349 Performance improvements:
0350         * Faster copy&paste in the spreadsheet
0352 Bug fixes:
0353         * Bug 379877 - masked rows in spreadsheet not restored in project
0354         * Calculation of fit results corrected
0355         * Axes now support values larger than FLT_MAX (~10^38) and smaller than FLT_MIN (~10^-38)
0356         * When a LabPlot project is being droped in the main window, load the project directly instead of showing the import file dialog
0357         * Correctly save and restore masked cells
0358         * Don't crash if the rc-file was not found during the startup
0360 -----2.4 (09.04.2017)-----
0361 New features:
0362         * Support themes for plots
0363         * Import and editing of FITS data files
0364         * Data reduction by removing data points using multiple algorithms
0365         * Numerical differentiation and integration with several options
0366         * Many new pre-defined fit models (Gompertz, Weibull, Log-Normal, Gumbel, etc.) sorted in categories
0367         * Fit parameter now support fixed values, lower/upper limits and use Unicode
0368         * Fit model and random number distribution formulas are now rendered with LaTeX
0369         * Support user specified x range in all analysis functions
0370         * Allow to enter complete LaTeX documents in text labels
0371         * Configuration parameter to use different LaTex engines (LuaLaTex, XeLatex, pdfLaTex, LaTex)
0372         * Disable LaTeX typesetting if no LaTex installation (and other required tools) were found at runtime
0373         * Presenter mode for worksheets
0374         * Support for Mac OS
0375         * Support for Julia's vectors and tuples in CAS worksheets (requires Cantor v. 16.12 or higher)
0376         * Allow to jump directly to the data source spreadsheet via XYCurve's context menu
0377         * Select and delete multiple objects in project explorer
0378         * Improved and extended internal parser for mathematical expressions
0379         * Copy of worksheet elements as image to the clipboard via CTRL+C
0381 Bug fixes:
0382         * BUG: 361326 - Allow to select curves with overlapping bounding boxes
0383         * Correctly load worksheet sizes from saved templates
0384         * Fixed crash when removing columns in spreadsheet
0385         * Fixed crash when fitting using GSL >= 2
0386         * List of available functions corrected
0387         * Constants are now available with full accuracy
0388         * Windows: Import of files and open recent files fixed
0390 -----2.3 (23.07.2016)-----
0391 New features:
0392         * Integration of Cantor - Support for different open-source computer algebra systems
0393         * Statistics on spreadsheets and matrices
0394         * Export of spreadsheets and matrices to LaTeX tables
0395         * Interpolation of data including different splines, cosine, exponential, cubic Hermite (Catmull-Rom, cardinal, Kochanek-Bartels) and rational functions
0396         * Data smoothing using moving average (centered or lagged), percentile filter or Savitzky-Golay algorithm
0397         * Fourier filter (low pass, high pass, band pass, band reject) with ideal, Butterworth, Chebychev I+II, Legendre or Bessel-Thomson filter
0398         * Fourier transform with many window functions (Welch, Hann, Hamming, etc.) calculating magnitude, amplitude, power, phase, dB, etc. and supporting
0399                 one/two sided spectrum with or without shift and x scaling to frequency, index or period
0400         * Filter and search capabilities in the drop down box for the selection of data sources
0401         * Sigmoid function as a new pre-defined fit model
0402         * Support for compiling on Microsoft Windows
0404 Performance improvements:
0405         * Faster generation of random values
0406         * Global option to enable/disable the double-buffering for faster painting of curves (enabled on default)
0408 Bug fixes:
0409         * Save and restore last used setting in RandomValuesDialog
0410         * Update axis title shape on title rotations correctly
0411         * Save and restore custom column widths in the spreadsheet
0412         * Fixed sporadic crashes during project close
0414 -----2.2 (29.03.2016)-----
0415 New features:
0416         * Datapicker - tool for extracting curves and data points from imported images
0417         * Custom point on the plot with user-defined position and appearance
0418         * Accept drag&drop events
0419         * Support GSL 2.x
0420         * Import and export dialogs save and restore their settings and sizes
0422 Performance improvements:
0423         * Faster rendering of the image view of the matrix
0425 Bug fixes:
0426         * BUG: 354744 - make setting of range auto scaling in CartesianPlot undo/redo-able
0427         * Removed couple of hard coded sizes given in pixels for better user-experience on hidpi-displays
0428         * Fixes the bug with disabled undo/redo-actions in after the undo-history was cleared
0429         * Keep the information about the columns to be shown in the project explorer after project close
0430         * Fixed some bugs in painting of the selection band on the worksheet
0431         * Allow to open gz- and bz2-compressed LabPlot project files on the command line interface
0433 -----2.1 (25.10.2015)-----
0434 New features:
0435         * New Matrix view for handling matrix data.
0436         * Workbook - a new container for grouping several objects of type Spreadsheet and/or Matrix.
0437         * Import of binary, image, NetCDF and HDF data into spreadsheet or matrix.
0438         * Visual HDF and NetCDF parser to view content of files and import data sets.
0439         * Preview of all supported file types in import dialog.
0440         * Transparently import compressed data files.
0441         * In xy-curve the points may not be connected by the line if there are NANs in-between. This behaviour is controlled by the parameter "skip gaps".
0442         * Multiplier of Pi format of the plot axis for periodical functions.
0443         * New operations on columns in Spreadsheet - reverse, drop values and mask values.
0444         * Formula used to generate the values in a column is stored and can be changed/adjusted in the formula dialog afterwards.
0445         * Curve filling: the area below, under, left to or right to the curve can be filled.
0446         * Support for multiple variables in "Function Values"-dialog - new data in the spreadsheet can be calculated out of multiple columns.
0448 Performance improvements:
0449         * Speeded up the creation of new columns during the import
0451 Bug fixes:
0452         * Fixed wrong behaviour when doing "zoom&select" in a plot and then deselecting the plot - it was not possible anymore to select the plot again on the worksheet.
0454 -----2.0.2 (15.03.2015)-----
0455 New features:
0456         * Plot 2D-curves defined by mathematical equations in cartesian and polar coordinates or via a parametric equation.
0457         * Linear and non-linear regression analysis. Several predefined fit-models are provided. User-defined models are also possible.
0458         * Besides fixed worksheet sizes (predefined sizes like A4 etc. or user-defined), complete view size can be used. All sizes are automatically adjusted on resize.
0459         * Different axis arrow types.
0460         * "select region and zoom in", "select x-region and zoom in", "select y-region and zoom in" functions for cartesian plot.
0461         * Rounded border for several worksheet objects  (plot area, legend etc.)
0462         * Hover effect for axis, curve and text label.
0463         * Added a MessageBox - ask befor deleting worksheet objects.
0464         * Added three new types for drop lines - "zero baseline", "min baseline" and "max baseline"
0465         * Fill the selection in Spreadsheet with a constant value provided by the user
0466         * Fill columns with uniform and non-uniform random numbers, several distributions are available.
0467         * Fill columns with function values
0468         * Allow custom resolutions for PNG-export
0469         * Export of the spreadsheet to a text file.
0470         * Simultaneous zooming and navigation accross multiple plots.
0471         * Implemented "Powers of 10/2/e" for the axis tick labels
0473 Bug fixes:
0474         * Don't crash when trying to create a plot in case no rc-file was installed.
0475         * Don't allow to select unwanted objects in TreeViewComboBox in ImportDialog and XYCurveDock.
0476         * Corrected painting of background images in plot area and legend.
0477         * BUG: 330723 - fixed weird selection in spreadsheet.
0478         * BUG: 330774 - fixed wrong positioning of axis on orientation changes.
0479         * Update main window title when project name is changed
0481 -----2.0.1 (01.03.2014)-----
0482 Bug fix release. Solved issues:
0483         * Fixed wrong scaling of legend's text labels in pdf-export
0484         * Fixed memory corruption in CartesianPlotDock that can lead to crashes
0486 -----2.0.0 (19.01.2014)-----
0487 First stable release of LabPlot2. LabPlot2 is a complete rewrite of LabPlot1 and lacks in this release a lot of features available in the predecessor. On the other hand, the GUI and the usability is more superior as compared to LabPlot1 and there are several new features that were not available in LabPlot1.
0489 Brief summary of features and capabilities of LabPlot2 implemented in the first release:
0490         * project-based management of data
0491         * created objects are organized in a tree and are visualized and accessible in the project explorer
0492         * for a better management of objects, additional folders and sub-folders can be created within a project
0493         * spreadsheet with very basic functionality is available for manual data entry
0494         * "file data source" can be used to import a file and to let LabPlot2 watch for changes in that file
0495         * external data from an ascii file can be also directly imported to a spreadsheet for further editing
0496         * worksheet is the main object where plots, labels etc. are placed on
0497         * several zooming functions for the worksheet
0498         * only cartesian plot is implemented in the first release
0499         * arbitrary number of freely positionable axes is possible
0500         * xy-curve is implemented. As the data source for the x- and y-values columns either from a spreadsheet
0501           or from a file data source can be used
0502         * several zooming and "movement" functions are available for the plots which help to navigate through data
0503         * legend for xy-plots
0504         * a lot of properties of the worksheet elements can be edited in a very easy way in the corresponding dock widgets
0505         * plots on the worksheet can be put into a horizontal, vertical or grid layouts
0506         * export of worksheet (entire worksheet or current seleciton) to pdf, eps, png and svg