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It is possible to write a parser in Fortran that reads a line of input and converts this into a string of commands that are evaluated whenever the function must be evaluated. In other words, the user may input the function to be evaluated in an input file. In our experience, the execution using this method is about twice that of programming, compiling and linking the equation. I didn't do this programming so I can't tell you much about how it was done. Harry R. Millwater, Ph.D. Probabilistic Mechanics and Reliability Section Southwest Research Institute, San Antonio, TX (210) 522-2006 Voice (210) 522-3042 Fax ---------- Original Text ---------- From: "Raffaele Borrelli" <[log in to unmask]>, on 10/16/00 2:37 AM: Hello, I would really appreciate a suggestion for the following problem: I must determine the values f(x(i)) of a function f(x) in a set of points x(i) (i=1,...,N). Every time I change the function I must compile the (very simple) program doing that. Now, is it possible to program something that reads the function f(x) as an input from a file and then calculates the values of the function in a set of specified points? I think that the problem can be restated in the following way: how can I do some mathematical operations specified in an input file, using a fortran program? I see that my question may be really difficult, but this would simplify very much my work. Thanks in advances, Lello. _________________________________________________________________________ la tua email gratuita e per sempre su http://www.freemail.it (anche POP3) %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%