 Rank: Newbie
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Joined: 23/02/2012(UTC)
Posts: 2
Location: UK
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I found a minor problem with trigonometric functions. The following problem occurs only for a value of 30 degrees, as you can see the value of sin evaluates differently depending on the construction of the math. And only when I am modifying the value of phi in expression shown.
It would not be a problem if a value of phi = 30 was not common in geotechnical engineering.
φ:30deg
γ:1.3
δ:atan(tan(φ)/γ)
δ=23.9468@'deg
β:sin(δ)
β=1.2177
sin(δ)=0.4059
Any thoughts?
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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,
The solution is to apply Optimization|Numeric or None on the region:
δ←atan(tan(φ)/γ)
This is a common advice to do first when you need just the numerical values.
BTW, the degrees does not work properly in v0.92
Regards,
Radovan |
When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!" |
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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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omorr wrote:BTW, the degrees does not work properly in v0.92 It doesn't wort in one case only - when you try to evaluate it numerically in a single line like:  P.S.: Will try to release new SMath Studio version as soon as possible. Regards.
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 1 user thanked Andrey Ivashov for this useful post.
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Rank: Newbie
Groups: Registered
Joined: 23/02/2012(UTC)
Posts: 2
Location: UK
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  Rank: Advanced Member Groups: Registered
Joined: 23/12/2011(UTC) Posts: 319  Location: italy Was thanked: 109 time(s) in 93 post(s)
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Hello,
Also in v.093 remains the problem reported by Scottg. The solution indicated by Radovan, it works properly.
Regards,
Sergio
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1 user thanked PompelmoTell for this useful post.
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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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Fixed in SMath Studio 0.94.  Regards.
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2 users thanked Andrey Ivashov for this useful post.
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on 30/05/2012(UTC), on 30/05/2012(UTC)
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