Rank: Administration Groups: Registered, Advanced Member Joined: 23/06/2009(UTC) Posts: 1,740 Was thanked: 318 time(s) in 268 post(s)
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Hello, Look at this please f:el(x,1)^3+el(x,2)^3 This is correct: diff(diff(f,el(x,1)),el(x,2))=0But this is obviously wrong: v0.95 diff(diff(f,el(x,2)),el(x,1))=-el(x,2)*(-1+el(x,2))It seems that is still present in v.90 as well: v0.90 diff(diff(f,el(x,2)),el(x,1))—-(-1+el(x,2))*el(x,2)In v0.89.8 you will get the right answer - zeros for both mixed derivatives. Regards, Radovan Edited by user 25 June 2012 11:21:40(UTC)
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When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!" |
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Rank: Administration Groups: Registered, Advanced Member Joined: 23/06/2009(UTC) Posts: 1,740 Was thanked: 318 time(s) in 268 post(s)
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Hello,
This is still present in 0.95 build 4594 (30 July 2012).
Any comments?
Regards, Radovan |
When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!" |
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Rank: Advanced Member Groups: Registered, Advanced Member Joined: 13/01/2012(UTC) Posts: 2,652 Location: Italy Was thanked: 1339 time(s) in 878 post(s)
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Hi omorr, Originally Posted by: omorr Hello,
This is still present in 0.95 build 4594 (30 July 2012).
Any comments?
Regards, Radovan I confirm! seem related to the symbolic simplification (see the attachments) regards, w3b5urf3r Edited by user 31 July 2012 02:03:47(UTC)
| Reason: Not specified File Attachment(s): Davide Carpi attached the following image(s): |
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1 user thanked Davide Carpi for this useful post.
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Rank: Advanced Member Groups: Registered, Advanced Member Joined: 13/01/2012(UTC) Posts: 2,652 Location: Italy Was thanked: 1339 time(s) in 878 post(s)
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Here some (probably) related issues. best regards, w3b5urf3r |
If you like my plugins consider to support SMath Studio buying a plan; to offer me a coffee: paypal.me/dcprojects |
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Rank: Advanced Member Groups: Registered
Joined: 05/03/2009(UTC) Posts: 433 Location: USA Was thanked: 17 time(s) in 15 post(s)
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It's the way SMath handles/prioritizes ASCII characters. I ran into a similar issue with MathCAD. In this case, the second variable of "x" (in the equation) has to be the first variable of the first derivative as shown in w3b5urf3r's screen shot.
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Rank: Administration Groups: Registered, Advanced Member Joined: 23/06/2009(UTC) Posts: 1,740 Was thanked: 318 time(s) in 268 post(s)
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Hello, I must be boring with this , but I think there is neither solution nor satisfactory explanation of this "glitch" regarding second derivatives. Still present in 0.96 Regards, Radovan omorr attached the following image(s): |
When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!" |
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Rank: Advanced Member Groups: Registered, Advanced Member Joined: 10/11/2010(UTC) Posts: 1,494 Was thanked: 1274 time(s) in 745 post(s)
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Russia ☭ forever Viacheslav N. Mezentsev |
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Rank: Administration Groups: Registered, Advanced Member Joined: 23/06/2009(UTC) Posts: 1,740 Was thanked: 318 time(s) in 268 post(s)
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Originally Posted by: uni Yes, I know. Thank you . I did it on purpose, just to put the stress that maple did it right. Regards, Radovan |
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