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!! +exec+ +string+
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$lst_tit eval$lst_titend$type_var
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  $lst_alias evalue
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  $(lst_syntax)eval $emph expr$emphend</span>
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  $lst_mean Returns the numerical value of the expression $emph expr$emphend.
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  $emph expr $emphend must evaluate to a real number (under the
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  current version of wims). The evaluation is internally done in double
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  precision, but the print precision can be changed by setting the variable
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  $emph wims_print_precision $emphend (whose default value is 8). <br/>
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  If an error is found in the expression $emph expr$emphend, 0 is returned.
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  (I know that this is very bad; I just have no time to make everything right.)
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