How do i convert an S-param text file to ABCD parameters using the command abcd_params = s2abcd(s_params, z0)

i have a text file containing the s-parameters. i want to convert it into ABCD paramters. i found a command "abcd_params = s2abcd(s_params, z0)" which serves the purpose. however it does so for a 2X2 matrix. the code is given:

%Define a matrix of S-parameters s_11 = 0.61*exp(j*165/180*pi); s_21 = 3.72*exp(j*59/180*pi); s_12 = 0.05*exp(j*42/180*pi); s_22 = 0.45*exp(j*(-48/180)*pi); s_params = [s_11 s_12; s_21 s_22]; z0 = 50; %Convert to ABCD-parameters abcd_params = s2abcd(s_params,z0)

and the code is working fine. what i want to know is that this code is probably valid for 1 set of s-param at a particular frequency, so how do i convert a list of this set of s-param at various frequencies.

[padoh]

how do we write a 2X2Xm matrix in matlab?