Re: subs() function in Maple V R5

From: Robert Israel (israel_at_math.ubc.ca)
Date: 08/19/04 

Date: 19 Aug 2004 06:28:28 GMT

In article <7ba41bbf.0408181539.5da4be62@posting.google.com>,
Mark Morse <dolphin4444@excite.com> wrote:
>Carl Devore <devore@math.udel.edu> wrote:

>> It is the order of evaluation. Arguments are usually evaluated before
>> being passed to a procedure. 0^n evaluates to 0. The subs never sees the
>> n.

>This is interesting. Maple is able to pre-evaluate the expression 0^n
>as 0 without knowing the value of n.

Yes, this particular "feature" is a cause of frequent complaints.
I don't know why it wasn't fixed ages ago, unless it's a "backwards
compatibility" problem.

>Does Maple always assume that variables are positive?

No, usually it's pretty good at not making unjustified assumptions.

Robert Israel israel@math.ubc.ca
Department of Mathematics http://www.math.ubc.ca/~israel
University of British Columbia
Vancouver, BC, Canada V6T 1Z2

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