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Question: How do I create a function using define_external?

Question:How do I create a function using define_external?

iff0 37 Maple
example error convert input
May 31 2007
0
Hi! I have an external library with this function: double test(double x) { return sin(x); } In Maple I am doing this: test := define_external('test', x::(float[8]), RETURN::(float[8]), LIB = "Test.dylib"); f := x->test(x); Now when I call f(2) for example, I get 0.909297426825681710 back. But if I try this: plot(f(y), y = 0 .. 2); I get this error message: Error, (in f) invalid input: test expects its 1st argument, x, to be of type numeric, but received y I think I need to somehow convert the (possible) symbolic input of f into a float[8] before it is passed to the procedure test, but I can't figure it out. Any help appreciated, thanks!
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