Example of loop usage: calculation of Root Mean Square (en.wikipedia.org/wiki/Root_mean_square).
//@version=2 study("Root Mean Square", shorttitle="RMS") // https://en.wikipedia.org/wiki/Root_mean_square src = input(close) sum = 0 len = input(10) for i = 0 to len sum := sum + src[i]*src[i] res = sqrt(sum/len) plot(res)