Is it possible to add a label to a plot output? 

Why doesn't calling Describe with a sequence input work?

S:= 1,2,3; Describe(S);

Error, (in Describe) invalid input: describe expects its 3rd argument, indent, to be of type string, but received 3
 

Does Maple have a built in hash map (associative array) datatype. I need to write a program where I will be iteratively building a lookup table. It will be very convenient for me if Maple has a hash map map structure built in.

I am new to Maple. I attempted to write a procedure that takes another procedure as input. It is not working correctly. As you can see from the output of a call to procedure A that something went wrong.
How do I do this correctly?
 

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