Problem in executing toeplitz (.) function

Dear Sir, I am facing a problem using toeplitz command.

I have a vector named R. And I want to run toeplitz( R ) but when I run it I get the following error;

??? Maximum variable size allowed by the program is exceeded.

Error in ==> toeplitz at 31 t = cidx(:,ones(p,1)) + ridx(ones(m,1),:); % Toeplitz subscripts

Error in ==> .. Rmat = toeplitz( R );

Can you help me in resolving this problem. When I run the toeplitz command on a smaller vector R, then i get correct results. It seems to me, therefore , that, larger size of R is creating this problem. How can I overcome it?

[Walter Roberson]

How large is R ?