SymEngine.f90 repeatedly evaluate an expression

4

@certik, that would be really great. In the mean time, instead of parsing before each evaluation, I will just copy the parsed expression.

        feval = f
        do j = 1, nvars
            feval = feval%subs(vars(j), vals(j))
        end do
        feval = feval%evalf()

This is not a very performance sensitive part of my code, so it will work fine for now.

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