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type:$type_var
alias:evalue
mean:Returns the numerical value of the expression `expr'. `expr' must evaluate to \
a real number (under the current version of wims). The evaluation is internally done in double\
precision, but the print precision can be changed by setting the variable\
`wims_print_precision' (whose default value is 8). <br/>\
If an error is found in the expression `expr', 0 is returned.\
(I know that this is very bad; I just have no time to make everything right.)