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  1. !! +exec+ +var+ +string+
  2. tit:evalsubst
  3. type:$type_both
  4. alias:evalsubstit, evalsubstitute, evaluesubst, evaluesubstit, evaluesubstitute
  5. syntax:!evalsubst ``name''=``val'' in ``expr''
  6. mean:Manipulation of mathematical expressions: substitute variable ``name'' by ``val'' in ``expr'', \
  7.   then evaluate the expression to a real number.  No regular expression is allowed in ``name''. <br>\
  8.   See also the commands\
  9.   $(ref1)cmdlist_mathsubst_&+cmd_choose=all$(ref2)cmdlist_mathsubst_">!mathsubst</a>,\
  10.  $(ref1)cmdlist_replace_&+cmd_choose=all$(ref2)cmdlist_replace_">!replace</a>.
  11.