[18504] in Athena Bugs
Re: sgi 8.4.16: Maple
daemon@ATHENA.MIT.EDU (Jacob Morzinski)
Tue Nov 14 17:40:01 2000
To: Jeremy A Teichman <jteichm@MIT.EDU>
Cc: bugs@MIT.EDU
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From: Jacob Morzinski <jmorzins@MIT.EDU>
Date: 14 Nov 2000 17:39:56 -0500
In-Reply-To: Jeremy A Teichman's message of "Tue, 14 Nov 2000 17:06:30 -0500"
Message-ID: <w6md7fyjhz7.fsf@oliver.mit.edu>
<jteichm@MIT.EDU> (Jeremy A Teichman) writes:
> What's wrong:
> The reported answer shows a spurious dependence on the order of the
> arguments. For the first case shown below, the correct answer is returned.
> For the second case, zero is returned.
>
> What should have happened:
> diff(sum(f(m,theta,r)*sin(m*theta),m=1..N),r);
> should produce the same result as
> diff(sum(f(m,r,theta)*sin(m*theta),m=1..N),r);
A comment from a passer-by:
I wish you had shown the output that Maple gave you. I ran Maple
three times. The first and third time where the GUI, the second
time was maple.tty (the command-line interface). I did not get
the same results each time, which is still probably a bug.
When I used the Maple6 GUI, both results were 0 and 0.
When I used the command-line version, I got 0 the first time and
a non-zero result the second time, which seems to be the opposite
from what you got.
> diff(sum(f(m,theta,r)*sin(m*theta),m=1..N),r);
bytes used=1020324, alloc=851812, time=0.55
0
> diff(sum(f(m,r,theta)*sin(m*theta),m=1..N),r);
bytes used=2020744, alloc=1244956, time=1.33
N
-----
\ /d \
) |-- f(m, r, theta)| sin(m theta)
/ \dr /
-----
m = 1
