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Topic: MuPAD questions
Replies: 1   Last Post: Dec 6, 1996 6:31 AM

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Chris Hecker

Posts: 53
Registered: 12/8/04
Re: MuPAD questions
Posted: Dec 6, 1996 6:31 AM
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zimmerma@leibniz.loria.fr (Paul Zimmermann) writes:
>1.2.9a>> sysassign(D(r),0): # in previous versions, just write D(r):=0 #

Okay, this one worked great, thanks.

>Here again, you can directly define the value of diff(theta,t):

Hmm, this one didn't work so well. The cos(theta) example you gave
worked, but what about this:

>>reset();
>>sysassign(diff(b,t),hold(diff)(b,t));sysassign(diff(c,t),hold(diff)(c,t));


diff(b, t)
diff(c, t)
>>a:=b*c;
b c
>>diff(a,t);
0
>>diff(b*c,t);
0

What's doing on there? I expected diff(b,t) * c + b * diff(c,t) via the
product rule.

In fact, even this fails:

>>diff(5*b,t);

0

I'd expect 5*diff(b,t), but it seems like the sysassign is just doing an
exact match instead of actually adding an evaluation rule.

Is there any way to do this?

Chris






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