Thanks for the suggestions. I've modified the code in PGgraphmacros.pl
to implement them. I've also called Context and Formula directly from
the modules so that MathObjects.pl does not need to be loaded. Loading
MathObjects caused confusion between the various forms of matrices.
(Matrix, MatrixReal1, and Value::Matrix).
The new version of the file is in the CVS.
Features & Development
Graphing functions like abs(x) with MathObjects
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