Fractional order root locus. This function generates the root locus (RL) plot of a fractional order transfer function (for LTI systems). The first plot is the RL on the s-plane, and the second plot is the RL on the 1st Riemann sheet of the s-plane The input is the numerator and denominator polynomial coefficients, and the fundamental order lambda (i.e. the lowest common denominator of all the fractional orders on numerator and denominator).