Generating 2D autocorrelation matrix

[Gravy1405]

Hi,

I would like to generate the autocorelation matrix of the signal:

x=randn(1,1000);

At the moment I am using::

Rxx=xcorr(x,'unbiased');

But this is only giving me a 1-dimensional autocorrelation sequence of size 1x1999(2N-1). But I would like the full 2D square autocorrelation matrix.

ie. Rxx = E{xxT} where T=transpose

Is this possible?

Thanks for your time,

Gravy