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<p><a id="X78C85ED17F00DCC1" name="X78C85ED17F00DCC1"></a></p>
<div class="ChapSects"><a href="chap77.html#X78C85ED17F00DCC1">77 <span class="Heading">Replaced and Removed Command Names</span></a>
<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap77.html#X7AA51AC9870D2360">77.1 <span class="Heading">Group Actions – Name Changes</span></a>
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<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap77.html#X831734077B00CB3B">77.2 <span class="Heading">Package Interface – Obsolete Functions and Name Changes</span></a>
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<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap77.html#X79676CD27EF0F096">77.3 <span class="Heading">Normal Forms of Integer Matrices – Name Changes</span></a>
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<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap77.html#X7F6A6CBC7C9E91E5">77.4 <span class="Heading">Miscellaneous Name Changes or Removed Names</span></a>
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<span class="ContSS"><br /><span class="nocss"> </span><a href="chap77.html#X87348614848EAD64">77.4-1 InfoObsolete</a></span>
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<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap77.html#X7F2FF72A7AD60E0C">77.5 <span class="Heading">The former .gaprc file</span></a>
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<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap77.html#X7C89E03285799F40">77.6 <span class="Heading">Semigroup properties</span></a>
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<h3>77 <span class="Heading">Replaced and Removed Command Names</span></h3>
<p>In general we try to keep <strong class="pkg">GAP</strong> 4 compatible with former releases as much as possible. Nevertheless, from time to time it seems appropriate to remove some commands or to change the names of some commands or variables. There are various reasons for that: Some functionality was improved and got another (hopefully better) interface, names turned out to be too special or too general for the underlying functionality, or names are found to be unintuitive or inconsistent with other names.</p>
<p>In this chapter we collect such old names while pointing to the sections which explain how to substitute them. Usually, old names will be available for several releases; they may be removed when they don't seem to be used any more.</p>
<p>Information about obsolete names is printed by <code class="func">Info</code> (<a href="chap7.html#X864E4B6886E2697D"><span class="RefLink">7.4-6</span></a>) using the <code class="func">InfoObsolete</code> (<a href="chap77.html#X87348614848EAD64"><span class="RefLink">77.4-1</span></a>) Info class. By default <code class="func">InfoObsolete</code> (<a href="chap77.html#X87348614848EAD64"><span class="RefLink">77.4-1</span></a>) is set to 1. Newly obsoleted identifiers should at first be outputted at info level 2. Once they have been removed from all packages, they should then be moved to info level 1, so they are visible to normal users, for at least one major release before being removed.</p>
<p>The functions <code class="code">DeclareObsoleteSynonym</code> and <code class="code">DeclareObsoleteSynonymAttr</code> take an optional final parameter, specifying the info level at which the given obsolete symbol should be reported. It defaults to 2 and 1, respectively.</p>
<p>The obsolete <strong class="pkg">GAP</strong> code is collected in two library files, <code class="file">lib/obsolete.gd</code> and <code class="file">lib/obsolete.gi</code>. By default, these files are read when <strong class="pkg">GAP</strong> is started. It may be useful to omit reading these files, for example in order to make sure that one's own <strong class="pkg">GAP</strong> code does not rely on the obsolete variables. For that, one can use the <code class="code">-O</code> command line option (see <a href="chap3.html#X782751D5858A6EAF"><span class="RefLink">3.1</span></a>) or set the user preference <code class="code">ReadObsolete</code> in the file <code class="file">gap.ini</code> to <code class="keyw">false</code> (see <a href="chap3.html#X7FD66F977A3B02DF"><span class="RefLink">3.2</span></a>). Note that the <code class="code">-O</code> command line option overrides <code class="code">ReadObsolete</code>.</p>
<p>(Note that the condition whether the library files with the obsolete <strong class="pkg">GAP</strong> code shall be read has changed. In <strong class="pkg">GAP</strong> 4.3 and 4.4, the global variables <code class="code">GAP_OBSOLESCENT</code> and <code class="code">GAPInfo.ReadObsolete</code> –to be set in the user's <code class="file">.gaprc</code> file– were used to control this behaviour.)</p>
<p><a id="X7AA51AC9870D2360" name="X7AA51AC9870D2360"></a></p>
<h4>77.1 <span class="Heading">Group Actions – Name Changes</span></h4>
<p>The concept of a group action is sometimes referred to as a <q>group operation</q>. In <strong class="pkg">GAP</strong> 3 as well as in older versions of <strong class="pkg">GAP</strong> 4 the term <code class="code">Operation</code> was used instead of <code class="code">Action</code>. We decided to change the names to avoid confusion with the term <q>operation</q> as in <code class="func">DeclareOperation</code> (<a href="chap78.html#X843F48137B899BC3"><span class="RefLink">78.1-5</span></a>) and <q>operations for Xyz</q>.</p>
<p>Here are some examples of such name changes.</p>
<div class="pcenter"><table class="GAPDocTable">
<tr>
<td class="tdleft"><em>OLD</em></td>
<td class="tdleft"><em>NOW USE</em></td>
</tr>
<tr>
<td class="tdleft"><code class="code">Operation</code></td>
<td class="tdleft"><code class="func">Action</code> (<a href="chap41.html#X85A8E93D786C3C9C"><span class="RefLink">41.7-2</span></a>)</td>
</tr>
<tr>
<td class="tdleft"><code class="code">RepresentativeOperation</code></td>
<td class="tdleft"><code class="func">RepresentativeAction</code> (<a href="chap41.html#X857DC7B085EB0539"><span class="RefLink">41.6-1</span></a>)</td>
</tr>
<tr>
<td class="tdleft"><code class="code">OperationHomomorphism</code></td>
<td class="tdleft"><code class="func">ActionHomomorphism</code> (<a href="chap41.html#X78E6A002835288A4"><span class="RefLink">41.7-1</span></a>)</td>
</tr>
<tr>
<td class="tdleft"><code class="code">FunctionOperation</code></td>
<td class="tdleft"><code class="func">FunctionAction</code> (<a href="chap41.html#X86153CB087394DC1"><span class="RefLink">41.12-4</span></a>)</td>
</tr>
<tr>
<td class="tdleft"><code class="code">IsLexicographicallyLess</code></td>
<td class="tdleft"><code class="func">\<</code> (<a href="chap31.html#X7EF67D047F03CA6F"><span class="RefLink">31.11-1</span></a>)</td>
</tr>
</table><br />
</div>
<p><a id="X831734077B00CB3B" name="X831734077B00CB3B"></a></p>
<h4>77.2 <span class="Heading">Package Interface – Obsolete Functions and Name Changes</span></h4>
<p>With <strong class="pkg">GAP</strong> 4.4 the package interface was changed. Thereby some functions became obsolete and the names of some others were made more consistent.</p>
<p>The following functions are no longer needed: <code class="code">DeclarePackage</code>, <code class="code">DeclareAutoPackage</code>, <code class="code">DeclarePackageDocumentation</code> and <code class="code">DeclarePackageAutoDocumentation</code>. They are substituted by entries in the packages' <code class="file">PackageInfo.g</code> files, see <a href="chap76.html#X85C8DE357EE424D8"><span class="RefLink">76.3-15</span></a>.</p>
<p>Furthermore, the global variable <code class="code">PACKAGES_VERSIONS</code> is no longer needed, since this information is now contained in the <code class="code">GAPInfo.PackagesInfo</code> record (see <a href="chap3.html#X8354754E7935F935"><span class="RefLink">3.5-1</span></a>). The global variable <code class="code">Revisions</code> is also no longer needed, since the function <code class="code">DisplayRevision</code> was made obsolete in <strong class="pkg">GAP</strong> 4.5 and removed in <strong class="pkg">GAP</strong> 4.7.</p>
<p>The following function names were changed.</p>
<div class="pcenter"><table class="GAPDocTable">
<tr>
<td class="tdleft"><em>OLD</em></td>
<td class="tdleft"><em>NOW USE</em></td>
</tr>
<tr>
<td class="tdleft"><code class="code">RequirePackage</code></td>
<td class="tdleft"><code class="func">LoadPackage</code> (<a href="chap76.html#X79B373A77B29D1F5"><span class="RefLink">76.2-1</span></a>)</td>
</tr>
<tr>
<td class="tdleft"><code class="code">ReadPkg</code></td>
<td class="tdleft"><code class="func">ReadPackage</code> (<a href="chap76.html#X870954577B27DCAB"><span class="RefLink">76.3-1</span></a>)</td>
</tr>
<tr>
<td class="tdleft"><code class="code">RereadPkg</code></td>
<td class="tdleft"><code class="func">RereadPackage</code> (<a href="chap76.html#X870954577B27DCAB"><span class="RefLink">76.3-1</span></a>)</td>
</tr>
</table><br />
</div>
<p><a id="X79676CD27EF0F096" name="X79676CD27EF0F096"></a></p>
<h4>77.3 <span class="Heading">Normal Forms of Integer Matrices – Name Changes</span></h4>
<p>Former versions of <strong class="pkg">GAP</strong> 4 documented several functions for computing the Smith or Hermite normal form of integer matrices. Some of them were never implemented and it was unclear which commands to use. The functionality of all of these commands is now available with <code class="func">NormalFormIntMat</code> (<a href="chap25.html#X81FB746E82BE6CDA"><span class="RefLink">25.2-9</span></a>) and a few interface functions.</p>
<p><a id="X7F6A6CBC7C9E91E5" name="X7F6A6CBC7C9E91E5"></a></p>
<h4>77.4 <span class="Heading">Miscellaneous Name Changes or Removed Names</span></h4>
<p>In former releases of <strong class="pkg">GAP</strong> 4 there were some global variable names bound to general information about the running <strong class="pkg">GAP</strong>, such as path names or command line options. Although they were not officially documented they were used by several users and in some packages. We mention here <code class="code">BANNER</code> and <code class="code">QUIET</code>. This type of information is now collected in the global record <code class="func">GAPInfo</code> (<a href="chap3.html#X8354754E7935F935"><span class="RefLink">3.5-1</span></a>).</p>
<p>Here are some further name changes.</p>
<div class="pcenter"><table class="GAPDocTable">
<tr>
<td class="tdleft"><em>OLD</em></td>
<td class="tdleft"><em>NOW USE</em></td>
</tr>
<tr>
<td class="tdleft"><code class="code">MonomialTotalDegreeLess</code></td>
<td class="tdleft"><code class="func">MonomialExtGrlexLess</code> (<a href="chap66.html#X7A30E10B820311D1"><span class="RefLink">66.17-14</span></a>)</td>
</tr>
<tr>
<td class="tdleft"><code class="code">MultRowVector</code></td>
<td class="tdleft"><code class="func">MultVectorLeft</code> (<a href="chap23.html#X7BEF28C981C42E16"><span class="RefLink">23.4-3</span></a>)</td>
</tr>
<tr>
<td class="tdleft"><code class="code">MutableCopyMat</code></td>
<td class="tdleft"><code class="func">MutableCopyMatrix</code> (<a href="chap26.html#X793CD4637F237915"><span class="RefLink">26.11-4</span></a>)</td>
</tr>
<tr>
<td class="tdleft"><code class="code">MutableIdentityMat</code></td>
<td class="tdleft"><code class="func">IdentityMat</code> (<a href="chap24.html#X7DB902CE848D1524"><span class="RefLink">24.5-1</span></a>)</td>
</tr>
<tr>
<td class="tdleft"><code class="code">MutableNullMat</code></td>
<td class="tdleft"><code class="func">NullMat</code> (<a href="chap24.html#X86D343A77D9B3D4D"><span class="RefLink">24.5-2</span></a>)</td>
</tr>
<tr>
<td class="tdleft"><code class="code">NormedVectors</code></td>
<td class="tdleft"><code class="func">NormedRowVectors</code> (<a href="chap61.html#X7D6537F87E940344"><span class="RefLink">61.9-11</span></a>)</td>
</tr>
<tr>
<td class="tdleft"><code class="code">RadicalGroup</code></td>
<td class="tdleft"><code class="func">SolvableRadical</code> (<a href="chap39.html#X8250D99A830DA832"><span class="RefLink">39.12-9</span></a>)</td>
</tr>
</table><br />
</div>
<ul>
<li><p>The operation <code class="code">PositionFirstComponent</code> has been deprecated in GAP 4.8 due to issues with its documentation and implementation, and was removed in GAP 4.10. Instead of <code class="code">PositionFirstComponent(list,obj)</code>, you may use <code class="code">PositionSorted(list,[obj])</code> or <code class="code">PositionProperty(list,x->x[1]=obj)</code> as a replacement, depending on your specific use case.</p>
</li>
<li><p>The five argument version of the operation <code class="code">MultRowVector</code> has been deprecated in GAP 4.10 since it was unused and only available for coefficient lists. Note that <code class="code">MultRowVector</code> was also renamed to <code class="code">MultVectorLeft</code>.</p>
</li>
<li><p>The function <code class="code">TemporaryGlobalVarName</code> has been deprecated in GAP 4.11. Code using it typically can be restructured to not need it, e.g. by using <code class="func">EvalString</code> (<a href="chap27.html#X7DE4CCD285440659"><span class="RefLink">27.9-5</span></a>).</p>
</li>
<li><p>A bunch of synonyms have been deprecated in GAP 4.13. The alternative names have always existed and so are safe to use even in code which is meant to run in older GAP versions.</p>
<div class="pcenter"><table class="GAPDocTable">
<tr>
<td class="tdleft"><em>Deprecated</em></td>
<td class="tdleft"><em>Recommended alternative</em></td>
</tr>
<tr>
<td class="tdleft"><code class="code">OneSM</code></td>
<td class="tdleft"><code class="func">OneSameMutability</code> (<a href="chap31.html#X8046262384895B2A"><span class="RefLink">31.10-2</span></a>)</td>
</tr>
<tr>
<td class="tdleft"><code class="code">InverseSM</code></td>
<td class="tdleft"><code class="func">InverseSameMutability</code> (<a href="chap31.html#X78EE524E83624057"><span class="RefLink">31.10-8</span></a>)</td>
</tr>
<tr>
<td class="tdleft"><code class="code">ZeroSM</code></td>
<td class="tdleft"><code class="func">ZeroSameMutability</code> (<a href="chap31.html#X8040AC7A79FFC442"><span class="RefLink">31.10-3</span></a>)</td>
</tr>
<tr>
<td class="tdleft"><code class="code">AdditiveInverseSM</code></td>
<td class="tdleft"><code class="func">AdditiveInverseSameMutability</code> (<a href="chap31.html#X84BB723C81D55D63"><span class="RefLink">31.10-9</span></a>)</td>
</tr>
<tr>
<td class="tdleft"><code class="code">OneAttr</code></td>
<td class="tdleft"><code class="func">One</code> (<a href="chap31.html#X8046262384895B2A"><span class="RefLink">31.10-2</span></a>), <code class="func">OneImmutable</code> (<a href="chap31.html#X8046262384895B2A"><span class="RefLink">31.10-2</span></a>)</td>
</tr>
<tr>
<td class="tdleft"><code class="code">InverseAttr</code></td>
<td class="tdleft"><code class="func">Inverse</code> (<a href="chap31.html#X78EE524E83624057"><span class="RefLink">31.10-8</span></a>), <code class="func">InverseImmutable</code> (<a href="chap31.html#X78EE524E83624057"><span class="RefLink">31.10-8</span></a>)</td>
</tr>
<tr>
<td class="tdleft"><code class="code">ZeroAttr</code></td>
<td class="tdleft"><code class="func">Zero</code> (<a href="chap31.html#X8040AC7A79FFC442"><span class="RefLink">31.10-3</span></a>), <code class="func">ZeroImmutable</code> (<a href="chap31.html#X8040AC7A79FFC442"><span class="RefLink">31.10-3</span></a>)</td>
</tr>
<tr>
<td class="tdleft"><code class="code">AdditiveInverseAttr</code></td>
<td class="tdleft"><code class="func">AdditiveInverse</code> (<a href="chap31.html#X84BB723C81D55D63"><span class="RefLink">31.10-9</span></a>), <code class="func">AdditiveInverseImmutable</code> (<a href="chap31.html#X84BB723C81D55D63"><span class="RefLink">31.10-9</span></a>)</td>
</tr>
</table><br />
</div>
</li>
</ul>
<p><a id="X87348614848EAD64" name="X87348614848EAD64"></a></p>
<h5>77.4-1 InfoObsolete</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ InfoObsolete</code></td><td class="tdright">( info class )</td></tr></table></div>
<p>is an info class to display warnings when an obsolete variable is used. By default, the info level for this class is set to 1, which will only show variables which will be removed in the next major version of GAP. Setting it to 2 will trigger further warnings, for variables which have alternative names, or may be removed in future. This class can be set to 0 to disable all obsolete warnings.</p>
<p>To check that the <strong class="pkg">GAP</strong> code does not use any obsolete variables at parsing time, and not at a runtime, use the <code class="code">-O</code> command line option, see <a href="chap3.html#X782751D5858A6EAF"><span class="RefLink">3.1</span></a>.</p>
<p><a id="X7F2FF72A7AD60E0C" name="X7F2FF72A7AD60E0C"></a></p>
<h4>77.5 <span class="Heading">The former .gaprc file</span></h4>
<p>Up to <strong class="pkg">GAP</strong> 4.4, a file <code class="file">.gaprc</code> in the user's home directory (if available, and <strong class="pkg">GAP</strong> was started without <code class="code">-r</code> option) was read automatically during startup, early enough for influencing the autoloading of packages and late enough for being allowed to execute any <strong class="pkg">GAP</strong> code. On Windows machines this file was called <code class="file">gap.rc</code>.</p>
<p>In <strong class="pkg">GAP</strong> 4.5 the startup mechanism has changed, see <a href="chap3.html#X7FD66F977A3B02DF"><span class="RefLink">3.2</span></a> for details. These new configuration files are now contained in a directory <code class="code">GAPInfo.UserGapRoot</code>.</p>
<p>For the sake of partial backwards compatibility, also the former file <code class="file">~/.gaprc</code> is still supported for such initializations, but this file is read only if the directory <code class="code">GAPInfo.UserGapRoot</code> does not exist. In that case the <code class="file">~/.gaprc</code> is read at the same time as <code class="file">gaprc</code> would be read, i. e., too late for influencing the startup of <strong class="pkg">GAP</strong>.</p>
<p>As before, the command line option <code class="code">-r</code> disables reading <code class="file">~/.gaprc</code>, see <a href="chap3.html#X782751D5858A6EAF"><span class="RefLink">3.1</span></a>.</p>
<p>To migrate from the old setup to the new one introduced with <strong class="pkg">GAP</strong> 4.5, first have a look at the function <code class="func">WriteGapIniFile</code> (<a href="chap3.html#X7B0AD104839B6C3C"><span class="RefLink">3.2-3</span></a>). Many users will find that all or most of what was set in the old <code class="file">~/.gaprc</code> file can now be done via the user preferences in a <code class="file">gap.ini</code> file. If you had code for new functions or abbreviations in your old <code class="file">~/.gaprc</code> file or you were reading additional files, then move this into the file <code class="file">gaprc</code> (without the leading dot, same name for all operating systems) in the directory <code class="code">GAPInfo.UserGapRoot</code>.</p>
<p><a id="X7C89E03285799F40" name="X7C89E03285799F40"></a></p>
<h4>77.6 <span class="Heading">Semigroup properties</span></h4>
<p>Until Version 4.8 of <strong class="pkg">GAP</strong> there was inconsistent use of the following properties of semigroups: <code class="code">IsGroupAsSemigroup</code>, <code class="code">IsMonoidAsSemigroup</code>, and <code class="code">IsSemilatticeAsSemigroup</code>. <code class="code">IsGroupAsSemigroup</code> was true for semigroups that mathematically defined a group, and for semigroups in the category <code class="func">IsGroup</code> (<a href="chap39.html#X7939B3177BBD61E4"><span class="RefLink">39.2-7</span></a>); <code class="code">IsMonoidAsSemigroup</code> was true for semigroups that mathematically defined monoids, but did not belong to the category <code class="func">IsMonoid</code> (<a href="chap51.html#X861C523483C6248C"><span class="RefLink">51.2-1</span></a>); and <code class="code">IsSemilatticeAsSemigroup</code> was simply a property of semigroups, there is no category <code class="code">IsSemilattice</code>.</p>
<p>From Version 4.8 onwards, <code class="code">IsMonoidAsSemigroup</code> returns <code class="keyw">true</code> for semigroups in the category <code class="func">IsMonoid</code> (<a href="chap51.html#X861C523483C6248C"><span class="RefLink">51.2-1</span></a>), and <code class="code">IsSemilatticeAsSemigroup</code> has been moved to the <strong class="pkg">Semigroups</strong> under the new name <code class="func">IsSemilattice</code> (<a href="../../pkg/semigroups/doc/chap12.html#X833D24AE7C900B85"><span class="RefLink">Semigroups: IsSemilattice</span></a>).</p>
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