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!! +exec+ +var+ +string+
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tit:evalsubst
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type:$type_both
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alias:evalsubstit, evalsubstitute, evaluesubst, evaluesubstit, evaluesubstitute
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syntax:!evalsubst ``name''=``val'' in ``expr''
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mean:Manipulation of mathematical expressions: substitute variable ``name'' by ``val'' in ``expr'', \
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  then evaluate the expression to a real number.  No regular expression is allowed in ``name''. <br>\
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  See also the commands\
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  $(ref1)cmdlist_mathsubst_&+cmd_choose=all$(ref2)cmdlist_mathsubst_">!mathsubst</a>,\
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  $(ref1)cmdlist_replace_&+cmd_choose=all$(ref2)cmdlist_replace_">!replace</a>.