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Thread: cosine in java

  1. #1
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    Post cosine in java

    how do i implement the cosine trig function in java?


  2. #2
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    Default Re: cosine in java

    Do you need to make an implementation, or do you just need a cosine function?

    If you just need cosine for somthing else, then check the Math class. It contains a cos method.

  3. #3
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    Default Re: cosine in java

    Unless you intend to draw the graph using Graphics2D, the math class contains the sine and cosine functions. They do however only work with radians, so you'll need a converted variable if you intend to have degrees as input.

    Example of the cosine:
     double x = Math.cos(Math.PI/6);
    edit: changed from int to double

    API:
    Math (Java 2 Platform SE v1.4.2)

    Hope that helps.
    Last edited by olemagro; January 22nd, 2010 at 08:37 AM.

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    Default Re: cosine in java

    casting to integers for cosine/sine is a bad idea. You'll almost always get zero because of truncation.

  5. The Following User Says Thank You to helloworld922 For This Useful Post:

    olemagro (January 22nd, 2010)

  6. #5
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    Default Re: cosine in java

    Ah, didn't know that. Noted to self!

    Edit: Come to think of it, I knew it but didn't consider the fact that int doesn't allow decimals which is crucial in most sine/cosine functions.
    Last edited by olemagro; January 22nd, 2010 at 04:12 PM.