Error integrating with interim result

#1 Posted: 7/23/2019 9:59:53 AM

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I have a simple integral calculation which contains a varable "n". If this variable is calculated in an earlier step, a wrong result is returned; the same calculation with a defined value for the variable (called "n2" in the example), the correct result appears. SMath Studio version 0.99, build 7030.

Is there a possibility to upload my sample file?

#2 Posted: 7/23/2019 10:04:05 AM

Arie

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What version are you running?

I'm not seeing this issue on 7109.

Might help if you also posted the .sm file in question.

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#3 Posted: 7/23/2019 10:07:13 AM

Stefan Weisskircher

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Hello alyles,
thanks for your answer! I have already edited my original post to add the version info.

i cannot find a button to upload my sample file...

(still searching)

#4 Posted: 7/23/2019 10:07:18 AM

Arie

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Wrote

Is there a possibility to upload my sample file?

Sorry I missed this. To upload start writing a comment, click the following button....

then click add file first. Navigate to file and select. Then you must click start upload to upload it.

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#5 Posted: 7/23/2019 10:11:11 AM

Stefan Weisskircher

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Thanks again, here we go:

Bug_Integral.sm (4 KiB) downloaded 36 time(s).

#6 Posted: 7/23/2019 10:12:41 AM

Arie

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Are you concerned with the fractional result on the red?

If so right click on that section and change optimization to numeric. You'll get a numeric result.

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#7 Posted: 7/23/2019 10:16:05 AM

Stefan Weisskircher

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Doesn't help, I still get "-18" in the left section (which isn't correct IMHO and still deiffers from the result on the right side (green))

#8 Posted: 7/23/2019 10:20:00 AM

Arie

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Ok I just tried this in 7030 (latest stable) and can confirm I get the same results as you. This looks like a bug.

when I performed the same calculation in the newest beta version, the results seem correct.

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#9 Posted: 7/23/2019 10:20:00 AM

Stefan Weisskircher

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Thanks a lot! So I don't have to search anymore!

#10 Posted: 7/24/2019 11:58:21 AM

Jean Giraud

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Wrote
Thanks a lot! So I don't have to search anymore!

Always plot the integrand for reluctant region.
Doctored SS 6179 ... seemingly same as SS7109

Bug_Integral [Doctored].sm (23 KiB) downloaded 30 time(s).

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Error integrating with interim result - Integral gives different result if a variable is calcukated (and not defined) - Messages