log() Math Calculation Web & Application void setup() { int i = 12; println(log(i)); println(log10(i)); } // Calculates the base-10 logarithm of a number float log10 (int x) { return (log(x) / log(10)); } Calculates the natural logarithm (the base-e logarithm) of a number. This function expects the values greater than 0.0. log(value) value int or float: number must be greater then 0.0 float 1.0 Function Core Extended