| Author |
Comment/Response |
Ned Moore
|
 09/23/08 2:27pm
hi,
I'm using v6.0 for students. I'm trying to integrate two arbitrary functions, w and delta w, of independent variables x,y, and t. The following code works properly:
Integrate[
Times[Derivative[2, 0, 0][w][x, y, t],
Derivative[2, 0, 0][\[Delta]w][x, y, t]], t, y, x]
The following (basically identical) code does not work properly
Integrate[
Times[Derivative[2, 0, 0][w][x, y, t],
Derivative[2, 0, 0][\[Delta]w][x, y, t]], x, y, t]
It doesn't do much of anything, in fact. It just returns the same integral as the input, whereas the first one returns a sum of a double integral and a triple integral, which is exactly what I want. All that I changed was the order of dxdydt from t,y,x to x,y,t, which doesn't seem like it should matter. Code is attached.
I'm afraid that I'll have to make a pattern to reorder the dxdydt's, which sounds terrible. Help!
Thanks
Ned
Attachment: WhatTheHeck.nb, URL: , |
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