FastMath acos fails when input abs value is less than about
5.7851920321187236E-300 - returns NaN
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Key: MATH-489
URL: https://issues.apache.org/jira/browse/MATH-489
Project: Commons Math
Issue Type: Bug
Reporter: Sebb
FastMath acos fails when input absolute value is less than about
5.7851920321187236E-300
It returns NaN instead of an expected value close to PI/2.0
This appears to be due to the following code:
{code}
// Compute ratio r = y/x
double r = y/x;
temp = r * 1073741824.0;
{code}
r and temp can become infinite or Nan.
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