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Symbolic calculation versus numeric calculation
  Rank: Member Groups: Registered
Joined: 05/02/2009(UTC) Posts: 13 Location: Germany
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Hello Smath,
I would like to thank you too for providing such a great program. When I tried some basic calculation I found some inconsistance in the way a term is evaluated.
If I try: π/6 + π/6 -> I will get 12π/36. By using the menu this can be simplified to π/3
If I assign: X1:=π/6 X2:=π/6 and try: X1 + X2 -> I will get 7440786129085100/7105427357601000
I would have expected the same result like in the direct calculation.
I had a similar effect when calculating a definite integral from -π/6 to +π/6 of cos(x)dx I will get the result 1. If I do the same integral for √2*cos(x)dx I will get 7071/5000
In general I would say that results should stay symbolic as far as possible. It would also be nice if results would already be simplified as far as possible.
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  Rank: Administration Groups: Developers, Registered, Knovel Developers, Administrators, Advanced Member Joined: 11/07/2008(UTC) Posts: 1,639   Was thanked: 2011 time(s) in 679 post(s)
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Thank you for the reports. sleschke wrote:when calculating a definite integral from -π/6 to +π/6 of cos(x)dx I will get the result 1. If I do the same integral for √2*cos(x)dx I will get 7071/5000 This happens because definite integrals program can evaluate only in numeric, that's why we can't fix it now. But I'll remember it for the future. sleschke wrote:If I assign: X1:=π/6 X2:=π/6 and try: X1 + X2 -> I will get 7440786129085100/7105427357601000 Thanks for this finding, will try to fix it till next release.
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  Rank: Administration Groups: Developers, Registered, Knovel Developers, Administrators, Advanced Member Joined: 11/07/2008(UTC) Posts: 1,639   Was thanked: 2011 time(s) in 679 post(s)
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One of the issues fixed:  Will be available in the next version of SMath Studio. Thank you once again 
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SMath Studio Forum
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Symbolic calculation versus numeric calculation
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