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evaluation can be done on variables via the variable command
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evaluation can be done on variables via the variable command
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$(ref1)cmdlist_eval_&cmd_choose=all$(ref2)cmdlist_eval_>!eval</a>.
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$(ref1)cmdlist_eval_&+cmd_choose=all$(ref2)cmdlist_eval_">!eval</a>.
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<p>
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<p>
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A variable may be defined or modified in a variable processing file, or by
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A variable may be defined or modified in a variable processing file, or by
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the commands
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the commands
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$(ref1)cmdlist_let_&cmd_choose=all$(ref2)cmdlist_let_>!let</a> and
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$(ref1)cmdlist_let_&+cmd_choose=all$(ref2)cmdlist_let_">!let</a> and
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$(ref1)cmdlist_default_&cmd_choose=all$(ref2)cmdlist_default_>!default</a>.
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$(ref1)cmdlist_default_&+cmd_choose=all$(ref2)cmdlist_default_">!default</a>.
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<p>
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<p>
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Variable names can contain any alphanumeric character, as well as the
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Variable names can contain any alphanumeric character, as well as the
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underscore character $(emph)_$emphend. There is a limit to the length of
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underscore character $(emph)_$emphend. There is a limit to the length of
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variable names, and a limit to the length of values. (Limits depending on
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variable names, and a limit to the length of values. (Limits depending on
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server configuration.)
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server configuration.)
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  <p><center><tt>$$M=x,y,z;a,b,c</tt>
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  <p><center><tt>$$M=x,y,z;a,b,c</tt>
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  </center> <p>
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  </center> <p>
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  (a 2x3 matrix), then
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  (a 2x3 matrix), then
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  <p><center>
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  <p><center>
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  <tt> $$(M[1;3,2])=z,y </tt>
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  <tt> $$(M[1;3,2])=z,y </tt>
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  </center> <p>
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 <li>If the character $emph$$$emphend is followed by the left bracket
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  </center> <li><p>If the character $emph$$$emphend is followed by the left bracket
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  $emph[$emphend, the matching $emph]$emphend will be located, the content
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  $emph[$emphend, the matching $emph]$emphend will be located, the content
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  of the pair of brackets substituted then evaluated to a real number value whose
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  of the pair of brackets substituted then evaluated to a real number value whose
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  precision depends on the value of $emph print_precision$emphend.
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  precision depends on the value of $emph print_precision$emphend.
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  This value will replace the whole thing
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  This value will replace the whole thing
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  together with the leading $emph$$$emphend. <br>
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  together with the leading $emph$$$emphend. <br>
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  (but may vary with the config of the installation).
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  (but may vary with the config of the installation).
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 <li>Variable names starting with $emph module_$emphend will have special
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 <li>Variable names starting with $emph module_$emphend will have special
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  meanings: they are used to hold variables defined in the module's INDEX
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  meanings: they are used to hold variables defined in the module's INDEX
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  file. Currently implemented variables:
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  file. Currently implemented variables:
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  <center><table border=0 cellspacing=10>
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  <center><table border=0 cellspacing=10>
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   <tr><td>$emph module_title<td>title of the module
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   <tr><td>$emph module_title$emphend<td>title of the module
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   <tr><td>$emph module_description<td>short description of the module
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   <tr><td>$emph module_description$emphend<td>short description of the module
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   <tr><td>$emph module_author<td>name(s) of author(s) of the module
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   <tr><td>$emph module_author$emphend<td>name(s) of author(s) of the module
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   <tr><td>$emph module_address<td>e-mail address of the (principal) author
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   <tr><td>$emph module_address$emphend<td>e-mail address of the (principal) author
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   <tr><td>$emph module_copyright<td>copyright notice of the module
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   <tr><td>$emph module_copyright$emphend<td>copyright notice of the module
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   <tr><td>$emph module_version<td>current version of the module
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   <tr><td>$emph module_version$emphend<td>current version of the module
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   <tr><td>$emph module_wims_version<td>minimal wims version required<br>
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   <tr><td>$emph module_wims_version$emphend<td>minimal wims version required<br>
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        to run this module
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        to run this module
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   <tr><td>$emph module_language<td>language of the module<br>(en, fr, de, or ...)
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   <tr><td>$emph module_language$emphend<td>language of the module<br>(en, fr, de, or ...)
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   <tr><td>$emph module_category<td>category of the module<br>
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   <tr><td>$emph module_category$emphend<td>category of the module<br>
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        (exercise, tool, course, pedia, recreation, adm, other)
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        (exercise, tool, course, pedia, recreation, adm, other)
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   <tr><td>$emph module_level<td>level of the module
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   <tr><td>$emph module_level$emphend<td>level of the module
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   <tr><td>$emph module_domain<td>algebra, analysis, geometry, ...
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   <tr><td>$emph module_domain$emphend<td>algebra, analysis, geometry, ...
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   <tr><td>$emph module_keywords<td>keywords, to be placed in the html header
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   <tr><td>$emph module_keywords$emphend<td>keywords, to be placed in the html header
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   <tr><td>$emph module_scoring<td>= yes if the module gives scores according
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   <tr><td>$emph module_scoring$emphend<td>= yes if the module gives scores according
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        to wims standard
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        to wims standard
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  </table></center>
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  </table></center>
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  Also, variables $emph module_has_intro$emphend,
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  Also, variables $emph module_has_intro$emphend,
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  $emph module_has_help$emphend and
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  $emph module_has_help$emphend and
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  $emph module_has_about$emphend
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  $emph module_has_about$emphend