Testing for unevaluated functions

*To*: mathgroup at yoda.physics.unc.edu (Mathematica Group)*Subject*: Testing for unevaluated functions*From*: jake at skatter.usask.ca (Jason Breckenridge)*Date*: Mon, 28 Sep 92 19:42:54 CST

Hello mathgroup, I have a question that I cannot seem to find the answer to in any of the Mma books that I have available. I would like to build a function that uses FindMinimum to search for a minimum (obviously). The problem is that as one varies one of the parameters of the function, a definite min. will move outside of the range of the search. I would like to test for this condition, and if Find Minimum cannot find a minimum=, then use one of the endpoints. The question is, is there no general mechanism for testing the return status of a function, or at least a built-in function? I would have thought tha there would be a way to write something like: If[UnevaluatedQ[FindMinimum[blah]], endpoint, FindMinimum[blah]] but I can't seem to find anything about any sort of "UnevaluatedQ" in the various books. Testing whether you get a list or not and then taking the list apart seems a tad inelegant. Thanks in advance for any info/suggestions. jake