Digital Image Processing "error exlpaination"

Hi all,

can anyone tell me why do we get the following error in matlab..??

" *Subscripted assignment dimension mismatch."

Error in ==> blkproc at 89 aa(border(1)+(1:ma),border(2)+(1:na)) = a;*

[David Young]

You need to show us the code you used to call blkproc. (Preferably just a few lines, but sufficient to run and demonstrate the error.)