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COMPILER 5.026 trigonometric function problems?

 
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benoitstjean



Joined: 30 Oct 2007
Posts: 299
Location: Ottawa, Ontario, Canada

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COMPILER 5.026 trigonometric function problems?
PostPosted: Fri Dec 29, 2017 10:29 am     Reply with quote

Compiler: 5.026
Device: PIC24EP512GP806

Is it possible that there are calculation issues with the sin() and cos() functions?

Because if you calculate just on a calculator:

cos(90) = 0
sin(90) = 1

If I do it with the compiler and do a printf on the screen, I get the following:

float x = cos(90); -> returns -0.448
float y = sin(90); -> returns 0.893

Am I missing anything here?

Thanks,

Ben


[EDIT] I found the problem. It is in RAD. I need to convert to DEG.
temtronic



Joined: 01 Jul 2010
Posts: 6030
Location: Greensville,Ontario

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PostPosted: Fri Dec 29, 2017 10:46 am     Reply with quote

oops ! Did the same thing using the Windows calculator and of course the W7 version is DIFFERENT than the XP one....sigh
so much for standards...
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