whats up with Java's Math class ?

Graphics and GPU Programming Programming

Started by staticVoid2 January 10, 2008 08:39 AM

3 comments, last by SiCrane 16 years, 3 months ago

381

Author

January 10, 2008 08:39 AM

hi, Has anyone ever noticed, if you use java's Math class that when, for example you want the sine of 180 it gives you 1.224646 etc... Now, correct me if i'm wrong, but shouldn't the sine of 180 be 0? Does anyone know of any algorithms, or good links, for trigonometric functions when you are dealing with degrees?

OrangyTang

1,298

January 10, 2008 08:46 AM

As the documentation states, the angle you pass to sin(), cos() etc. is in radians, not degrees. Conviniently it also provides toRadians() if you prefer to work in degrees for some reason.

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staticVoid2

381

Author

January 10, 2008 08:55 AM

yeh, try using Math.sin(Math.toRadians(180)) and it gives you 1.224646...

staticVoid2

381

Author

January 10, 2008 09:03 AM

sorry, i never saw that it was to the power -16. but should it not exactly be 0.

SiCrane

11,840

January 10, 2008 09:11 AM

What Every Computer Scientist Should Know About Floating-Point Arithmetic

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whats up with Java's Math class ?

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