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BrianP1-Visitor
1-Visitor
October 14, 2014
Question

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

  • October 14, 2014
  • 14 replies
  • 5162 views

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

F
Fred_Kohlhepp23-Emerald I
23-Emerald I
October 14, 2014

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.)

B
BrianP1-VisitorAuthor
1-Visitor
October 14, 2014

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".

F
Fred_Kohlhepp23-Emerald I
23-Emerald I
October 14, 2014

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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