plotresp - plot mag and phase response. [ax1,ax2] = plotresp( x, N, fs, fmt, xmin, xmax, ymin, ymax, blog, nophase ) ax1 - mag axis handle ax2 - phase axis handle x - signal N - FFT length fs - sample rate, Hz fmt - line format string xmin - freq axis min, default = 20 Hz xmax - freq axis max, default = fs/2 Hz ymin - mag axis min, default = -100 dB ymax - mag axis max, default = 100 dB blog - log axis flag, default = 0 nophase - no phase plot flag, default = 0