It means your solve block is not properly formed.
What software are you using? The file you posted seems to be a Mathcad file, not a studyworks file. Mathcad issues are best handled in the Mathcad collaboratory (
http://collab.mathsoft.com/~Mathcad2000 ) rather than the Studyworks collaboratory.
Your solve block is completely wrong.
All variables used in a solve block need to be previously defined. That includes the unknowns, which have to have guess values assigned.
You have assignment (:=) statements within the solve block. While Mathcad 14 allows you to position assignments within the solve block, you should not really do so. Such assignments don't work the way you think they do. They are not logically a part of the solve block.
You cannot name elements of an array as the unknowns for which to solve. You can solve for an array valued unknown, but not individual elements.
Find is essentially a numeric algorithm. You should use it with numeric (not symbolic) evaluation. While under some circumstances the symbolic processor can deal with such evaluations (and note that the rules for the symbolic processor are rather different from those for the numeric processor) in general it doesn't work. Don't use it unless you have a very specific reason for doing so, and have studied enough of Mathcad to know what you are doing.
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� � � � Tom Gutman
