Question

I have a formula that uses a logarithm function with a custom base, for example: logarithm with a base of b and value of x. In Objective-C, I know there are log functions that calculate without a base and base of either 2 or 10.

Is there a function that has the ability to calculate a log function with a custom/variable base? Or is there an alternative method of computing this formula?

The basic idea of my formula is this: log1.02 1.26825. This should equal 12.000.

Answer 1

Like this:

double logWithBase(double base, double x) {
    return log(x) / log(base);
}