Hi,
Based on your question I understand that you are facing difficulty in using parfor loop.
It looks like the error is related to the use of parfor and the fact that you are using the loop variable cmb_idx to index an array in the inner loop (ps_raw(cmb_idx,fi,win_idx)). When using parfor, each iteration of the loop is executed on a separate worker process, and these workers cannot communicate directly with each other. Therefore, they need to be careful about accessing shared variables. In particular, they cannot access shared variables in a way that might lead to race conditions or other synchronization issues.
One possible explanation for the error you are seeing is that two workers are trying to access the same element of ps_raw at the same time, causing a conflict. This could happen if two iterations of the loop happen to have the same value of cmb_idx.
Another issue that could be related to the error is the fact that you are pre-allocating the ps_raw and sz_tags arrays outside of the loop. When using parfor, it is important to make sure that each worker has its own copy of these arrays, otherwise they could conflict with each other. One way to ensure this is to create a temporary array inside the loop and then combine the results afterwards.
Lastly, you may want to consider using the Parallel Computing Toolbox's debugging tools to help diagnose the issue. For example, you can use the dbstop command to set a breakpoint at a specific line of code, which can help you see what is happening when the error occurs.
Hope it helps!
Regards,
Raghav Bansal
