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mathmathematical-optimizationnumerical-methodsexponentnumerical-analysis

Calculate power with fixed (constant) exponent

I have a case where I need to calculate x^y a vast number of times where y is a constant and x is guaranteed to be a valid number.

How can this be done more efficiently that Pow(double x, double y), which will perform various checks and evaluations?

I am looking to precalculate the y transformation.

EDIT

Both are real numbers. x = 0 ... 4,000,000,000.

Solution

  • Remember this equiality:

    x^y = exp(y * ln(x))

    So you can skip Pow and use exp and ln.