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This reference is for Processing 3.0+. If you have a previous version, use the reference included with your software in the Help menu. If you see any errors or have suggestions, please let us know. If you prefer a more technical reference, visit the Processing Core Javadoc and Libraries Javadoc.

Name | ### acos()
Examples |
    float a = PI;
    float c = cos(a);
    float ac = acos(c);
    // Prints "3.1415927 : -1.0 : 3.1415927"
    println(a + " : " + c + " : " +  ac);
    float a = PI + PI/4.0;
    float c = cos(a);
    float ac = acos(c);
    // Prints "3.926991 : -0.70710665 : 2.3561943"
    println(a + " : " + c + " : " +  ac);
Description | The inverse of cos(), returns the arc cosine of a value. This function expects the values in the range of -1 to 1 and values are returned in the range 0 to PI (3.1415927).
Syntax |
    acos(value)
Parameters |
value | float: the value whose arc cosine is to be returned
Returns | float
Related | cos() asin() atan()

Updated on July 4, 2018 11:56:42am EDT