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BrianP1-Visitor
1-Visitor
Oct 14, 2014 3:35 PM UTC
Question

This solve used to work but now not in ver 15- why??

I have a MCAD file from a version 12 that now requires a different set of tricks in ver 15 to make it work. I'm trying to understand why, and if there is really a better way to approach to original solution. We are not using MCAD Prime at this time.

thanks,

Brian

14 replies

Fred_Kohlhepp23-Emerald I
23-Emerald I
Oct 14, 2014 3:49 PM UTC

Recognize that if Rs is not zero then the numerator must be zero, throw out the denominator.

(The difference between version 12 and 15 is Maple vs Mupad.)

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BrianP1-VisitorAuthor
1-Visitor
Oct 14, 2014 4:22 PM UTC

Thanks Fred,

Oh yeah I forgot about the symbolic engine difference. As far as your suggestion, I get that in this one case but in general if the denominator is also a function of x, then there might be a case where you get 0/0. Its possible that by inspection one might see such a case in advance of sicking MAD on it as well. But if you have to do too much of this then the tool isn;t much good.

I guess I'm wondering why MathCad needs so much help to do it. Not sure why it jsut doesn't "work".

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Fred_Kohlhepp23-Emerald I
23-Emerald I
Oct 14, 2014 5:47 PM UTC

Your denominator is zero if x is 0 or 1 (unless h or b is zero, so your 0/0 is not probable.

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