Error integrating with interim result - Integral gives different result if a variable is calcukated (and not defined) Options  Email this topic  Watch this topic  Print this topic » Normal Threaded

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Stefan Weisskircher		#1 Posted : 23 July 2019 15:59:53(UTC)
Rank: Newbie Groups: Registered Joined: 23/07/2019(UTC) Posts: 7 Location: Saarbrücken		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? Edited by user 23 July 2019 16:03:04(UTC)  | Reason: Not specified
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alyles		#2 Posted : 23 July 2019 16:04:05(UTC)
Rank: Advanced Member Groups: Registered Joined: 23/03/2016(UTC) Posts: 276 Was thanked: 91 time(s) in 57 post(s)		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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Stefan Weisskircher		#3 Posted : 23 July 2019 16:07:13(UTC)
Rank: Newbie Groups: Registered Joined: 23/07/2019(UTC) Posts: 7 Location: Saarbrücken		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) Edited by user 23 July 2019 16:09:16(UTC)  | Reason: Not specified
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alyles		#4 Posted : 23 July 2019 16:07:18(UTC)
Rank: Advanced Member Groups: Registered Joined: 23/03/2016(UTC) Posts: 276 Was thanked: 91 time(s) in 57 post(s)		Originally Posted by: Stefan Weisskircher 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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Stefan Weisskircher		#5 Posted : 23 July 2019 16:11:11(UTC)
Rank: Newbie Groups: Registered Joined: 23/07/2019(UTC) Posts: 7 Location: Saarbrücken		Thanks again, here we go: Bug_Integral.sm (5kb) downloaded 16 time(s).
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alyles		#6 Posted : 23 July 2019 16:12:41(UTC)
Rank: Advanced Member Groups: Registered Joined: 23/03/2016(UTC) Posts: 276 Was thanked: 91 time(s) in 57 post(s)		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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Stefan Weisskircher		#7 Posted : 23 July 2019 16:16:05(UTC)
Rank: Newbie Groups: Registered Joined: 23/07/2019(UTC) Posts: 7 Location: Saarbrücken		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))
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alyles		#8 Posted : 23 July 2019 16:20:00(UTC)
Rank: Advanced Member Groups: Registered Joined: 23/03/2016(UTC) Posts: 276 Was thanked: 91 time(s) in 57 post(s)		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. Edited by user 23 July 2019 16:21:47(UTC)  | Reason: Not specified
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Stefan Weisskircher		#9 Posted : 23 July 2019 16:20:00(UTC)
Rank: Newbie Groups: Registered Joined: 23/07/2019(UTC) Posts: 7 Location: Saarbrücken		Thanks a lot! So I don't have to search anymore! Edited by user 23 July 2019 16:23:20(UTC)  | Reason: Not specified
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Jean Giraud		#10 Posted : 24 July 2019 17:58:21(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		Originally Posted by: Stefan Weisskircher 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 (24kb) downloaded 17 time(s).
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