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The first is a command 0141 from Plain TeX, and the second is LaTeX-specific. 0142 </p> 0143 <p>The <code>ignorespaces</code> is often used when defining commands via 0144 <code>\newcommand</code>, or <code>\newenvironment</code>, or <code>\def</code>. The 0145 example below illustrates. It allows a user to show the points values 0146 for quiz questions in the margin but it is inconvenient because, as 0147 shown in the <code>enumerate</code> list, users must not put any space between 0148 the command and the question text. 0149 </p> 0150 <div class="example"> 0151 <pre class="example">\newcommand{\points}[1]{\makebox[0pt]{\makebox[10em][l]{#1~pts}} 0152 \begin{enumerate} 0153 \item\points{10}no extra space output here 0154 \item\points{15} extra space between the number and the `extra' 0155 \end{enumerate} 0156 </pre></div> 0157 0158 <p>The solution is to change to this. 0159 </p> 0160 <div class="example"> 0161 <pre class="example">\newcommand{\points}[1]{% 0162 \makebox[0pt]{\makebox[10em][l]{#1~pts}}\ignorespaces} 0163 </pre></div> 0164 0165 <p>A second example shows spaces being removed from the front of text. The 0166 commands below allow a user to uniformly attach a title to names. But, 0167 as given, if a title accidentally starts with a space then 0168 <code>\fullname</code> will reproduce that. 0169 </p> 0170 <div class="example"> 0171 <pre class="example">\makeatletter 0172 \newcommand{\honorific}[1]{\def\@honorific{#1}} % remember title 0173 \newcommand{\fullname}[1]{\@honorific~#1} % put title before name 0174 \makeatother 0175 \begin{tabular}{|l|} 0176 \honorific{Mr/Ms} \fullname{Jones} \\ % no extra space here 0177 \honorific{ Mr/Ms} \fullname{Jones} % extra space before title 0178 \end{tabular} 0179 </pre></div> 0180 0181 <p>To fix this, change to 0182 <code>\newcommand{\fullname}[1]{\ignorespaces\@honorific~#1}</code>. 0183 </p> 0184 <p>The <code>\ignorespaces</code> is also often used in a <code>\newenvironment</code> 0185 at the end of the <var>begin</var> clause, that is, as part of the second 0186 argument, as in <code>\begin{newenvironment}{<var>env 0187 name</var>}{... \ignorespaces}{...}</code>. 0188 </p> 0189 <p>To strip spaces off the end of an environment use 0190 <code>\ignorespacesafterend</code>. An example is that this will show a much 0191 larger vertical space between the first and second environments than 0192 between the second and third. 0193 </p> 0194 <div class="example"> 0195 <pre class="example">\newenvironment{eq}{\begin{equation}}{\end{equation}} 0196 \begin{eq} 0197 e=mc^2 0198 \end{eq} 0199 \begin{equation} 0200 F=ma 0201 \end{equation} 0202 \begin{equation} 0203 E=IR 0204 \end{equation} 0205 </pre></div> 0206 0207 <p>Putting a comment character <code>%</code> immediately after the 0208 <code>\end{eq}</code> will make the vertical space disappear, but that is 0209 inconvenient. The solution is to change to 0210 <code>\newenvironment{eq}{\begin{equation}}{\end{equation}\ignorespacesafterend}</code>. 0211 </p> 0212 0213 0214 0215 <hr/><div class='referenceinfo'> <a href='https://latexref.xyz/'> <i>Unofficial LaTeX2e reference manual</i></a></div> 0216 </body> 0217 </html>