Why doesn't the DMODCE function take in a matrix input when using it for MSK Modulation in the Communications Toolbox 2.0 (R12.1)?

When I run the following code:

M = 2;   % states in the modulation

Fd = 1E3;  % data rate

Fs = 10E3; % set the sample frequency

Nd = 12;  % set the number of data points

MsgData = randint(Nd,3,M); 

Envelope = dmodce(MsgData,Fd,Fs,'msk');

I get the following error:

 ??? Error using ==> vertcat

 All rows in the bracketed expression must have the same 

 number of columns.

 Error in ==> D:\R12.1\toolbox\comm\comm\dmodce.m

 On line 198  ==>         x = [0; x(1:end-1)];

Answer 1

[MathWorks Support Team]

This bug has been fixed in the Communications Toolbox 2.1 (R13). If you are using a previous version, read the following:

This is a bug in the Communications Toolbox 2.0 (R12.1) when using the DMODCE function with matrix inputs for MSK modulation.

There are no workarounds.