filternorm Calculates the L-2 norm or L-infinity norm of a digital filter L = filternorm(b,a) L = filternorm(b,a,pnorm) L = filternorm(b,a,2,tol) b: The filter numerator coefficients. a: The filter denominator coefficients. pnorm: The L-norm to be calculated. The values accepted are 2 (L2 norm) or %inf (L-infinity norm). Default value is 2. tol: The tolerance of the L-2 norm to be calculated. If tol not specified, it defaults to 10^(-8). tol must be a positive scalar norm zp2sos Ayush Baid