Alan Bromborsky wrote: > What is the best way for a module to test to see if a particular symbol > (in my case 't') has been created in the main program? I don't want a > function to differentiate with respect to time if 't' has not been created. > > > > > Actually what I should have asked is how can you test if a function has a particular argument and how can you test for a function in general?
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