$lst_tit evalsubst$lst_titend$type_both
$lst_alias evalsubstit, evalsubstitute, evaluesubst,
evaluesubstit, evaluesubstitute<br>
$(lst_syntax)evalsubst $emph name=val $emphend in $emph
expr$emphend</tt> <br>
$lst_mean Manipulation of mathematical expressions: substitute variable
$emph name$emphend by $emph val$emphend in $emph expr$emphend, then
evaluate the expression to a real number. <br>
No regular expression is allowed in $emph name$emphend. <br>
See also the commands
$(ref1)cmdlist_mathsubst_&cmd_choose=all$(ref2)cmdlist_mathsubst_>!mathsubst</a>,
$(ref1)cmdlist_replace_&cmd_choose=all$(ref2)cmdlist_replace_>!replace</a>.