model array size problem

[VedaHung]

Hello RSA Experts,

I had an experiment with six conditions, each of which had 40 trials.
When I ran RSA model with fMRISearchLight().
Matlab showed the error message "Requested 240x240x54x64x50 (74.2GB) array exceeds maximum array size preference". So, I tried two things:
First, I unchecked "limit the maximun array size preference" and reran the script, which still led to matlab crash.
Second, I modified my model so it evaluates one condition at a time. specifically, the 240240 matrix of the model was reduced to 40240. However, I still got the same error message.
Any help on this issue is appreciated. Thanks.

Best,
Veda

[iancharest]

Hi Veda,

not sure you solved this actually, but this seems like the size of the searchlightRDMs array that matlab is trying to pre-allocate is very large. by the numbers you submit, it sounds like the code thinks that you have 240 conditions (and not 6 like you mention). It tries to create a searchlightRDMs structure of 240x240 x dimx x dimy x dimz, and complains that you don't have enough RAM on your computer to do so.
(dimx = nvoxels in x, dimy = nvovels in y, etc.)

ian