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Difference between symbolic and numeric calculation on imaginary unit
Rank: Newbie
Groups: Registered
Joined: 28/11/2012(UTC) Posts: 1
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Hello, I try to calculate "(1/i)*(1/i)" either in symbolic and numeric method and I get "1" and "-1" respectively. Note that this problem does not appear with the expression "(1/i^2)". In attachment a simple .sm file to illustrate the bug. Best regards, Gossage Edited by moderator 01 May 2013 01:18:14(UTC)
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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 Gossage,
I just can confirm this. Have no explanation of this, except that this is definitely a bug. Regards, Radovan |
When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!" |
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Rank: Member Groups: Registered
Joined: 15/05/2012(UTC) Posts: 14 Location: Profeta Miqueas Oe10-309 y Tabiazo Was thanked: 7 time(s) in 4 post(s)
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There are other problems with the symbolic interpretation. Did you tried to compute sin(-4*pi/3) and sin(2*pi/3) in the numeric and symbolic methods? Edited by user 29 November 2012 01:52:11(UTC)
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Ecuadorian Electronic engineer and MBA student at Salesian Polytechnic University. |
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Rank: Advanced Member Groups: Registered
Joined: 15/04/2012(UTC) Posts: 1,986 Was thanked: 1124 time(s) in 721 post(s)
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Hi
These examples just illustrate the known fact that the SMath symbolic engine is unreliable. Currently, it is not safe to use it. The Numeric engine seems to be more reliable, thus it's usage can be recommended.
What to do if you need symbolic calculations? There is a plugin that communicates with a dos version of maple and is much more powerful than the SMath internal engine. However, the plugin is not localization-safe, i.e. if argument delimiter is set to semicolon ;
I would like SMath to be an 2D document interface to maxima, which has all the math (including units) one would need but lacks the MathCad like document interface.
Best regards, MK |
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Rank: Administration Groups: Developers, Registered, Knovel Developers, Administrators, Advanced Member Joined: 11/07/2008(UTC) Posts: 1,616 Was thanked: 1978 time(s) in 666 post(s)
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1 user thanked Andrey Ivashov for this useful post.
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Difference between symbolic and numeric calculation on imaginary unit
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