MathGroup Archive 2008

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Re: ClearAll error message

Actually this was not a big deal.  The group working with the program was
puzzled by the message but soon it was fixed. BTW, one student came
with an elegant one-liner to create a nxn symmetric array:


The Clear behavior seems largely a question of esthetics.  One of the basic
rules of functional programming is function composition equivalence:

        y:=f(x); z:=g(y)    equiv    z:=g(f(x))

Since   name=Symbol["A"]; ClearAll[name] is not equivalent
to   ClearAll[Symbol["A"]] the rule is violated here, and likewise
for any function with HoldAll attribute.  Correct?

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