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ttokoro
ttokoro21-Topaz I
21-Topaz I
December 24, 2018
Solved

Need help with my Mathcad sheet

Prime 5.0 Electric Circuit 

When L=1 my Mathcad sheet shows no error.

When L=2 the sheet has an error. 

 I want to know the reason of my error.

 

 

 

Werner_E
Werner_EAnswer
25-Diamond I
December 27, 2018

Ah, I see. Again the problem is the wrong symbolic evaluation of the definite integral.

 

You may consider reporting this bug to PTC, but don't expect a bug fix in reasonable time.

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6 replies

Werner_E
Werner_E25-Diamond I
25-Diamond I
December 24, 2018

Can't explain why but as long as I can remember MuPad had its problems with integrals. Some errors were fixed but obviously not all.

As you are after a numeric value its always better to use either a numeric solve block or the root-function.

B.png

BTW, you should never use the variable of integration as an integral limit. Thats why I used tau.

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    ttokoro
    ttokoro21-Topaz IAuthor
    21-Topaz I
    December 26, 2018

    Thanks the advice, "Never use the variable of integration as an integral limit."

    error2.giferror2a.gif 

    Tokoro.

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    t.t.
    Werner_E
    Werner_E25-Diamond I
    25-Diamond I
    December 27, 2018

    Hmm, the advice had nothing to do with the root command and I have no idea what the difference between the two root calculations in your pic may be and why we see different results with numeric and symbolic eval.

    You would have to send the file.

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