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Argument unit to evaluate cosine function ?

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Old   December 21, 2016, 11:49
Default Argument unit to evaluate cosine function ?
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fluidflowsteel
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Hi

Can any one help me in this ?

I have one equation where Theta = Foam::atan2(y,x) where y and x can be any value integer or floating type. Thus the value of the Theta will be in the range of -pi to + pi in radians as per the atan2 function.

Then i need to find out the value of cos(Theta).

Now my question is whether the argument Theta has to be in radians to get the cosine value or I need to convert the Theta from radians to degrees to get the cosine value ?

with regards
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Old   December 21, 2016, 15:54
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Tobias Holzmann
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Hi,

FOAM works with radians either than with degree. You also can make some simple checks. What does cos(pi) return or what does cos(90) return within FOAM. Assuming that we would need degree, the second one should return 0.
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