Auto correlation of a matrix error?

Hi,

I have a matrix 1000x1000 (E) that represents a picture of a pattern of speckle. In order to find the largeness of these speckle I thought to do a cross correlation.

So I write dimension= xcorr2(E), is this correct?

Because matlab gives me this error:

Unable to perform assignment because the indices on the left side are not compatible with the size of the right side.

Error in Intensity (line 371)
    cross(v)=xcorr2(E)

[Athul Prakash]

Could you post more of your code/variables here? I tried xcorr2() on a (random) 1000x1000 matrix and it was working fine. Further, which Matlab release are you using?

Could 'Intensity' mentioned in the error be a custom file on your hard disk? To myknowledge, Matlab does not include a file named 'Intensity.m'