Hi all,
I'm using the Princeton MVPA toolbox in MATLAB, with AFNI.
I did a searchlight analysis and got four of the accuracy maps for each fold (see the 'MAE_L_srch_x' in the pattern in the attached image).
Then, I got an averaged accuracy map by averaging those four maps (i.e., 'MAE_L_srch_avg'), which is a format of [the number of voxels X accuracy].

My question is how to write an AFNI-readable file in MATLAB with the averaged map.
I'm trying to use the 'write_to_afni.m' function, and I get an error like the image showing an error message.

The variable 'sample_filename' is the file directory in the error, and in the directory, I have both BRIK, HEAD files of '270616OCY.AVmae.MVPA+orig.'
And I don't get why the directory has 'allvolszeros_/' in front of it.

I would appreciate it if anyone gives me a hint to solve this issue! Many thanks in advance!