Hej!
Beginning this week, I have begun to have a problem with the SPM12 smooth function. Sometimes when I run it on a typical fMRI data set (3.5 mm^3 voxels, 300 volumes, 8 mm FWHM kernel), it will only take 8-10 minutes. However, it is becoming more typical for the smoothing function to take over 7 hours to process any similarly sized data set. I have observed this behavior when I run the smooth function as a stand alone process, include it in a string of processes, and run it as part of a batch job. Just to add to the randomness (and fun), when running a batch job for several data sets, I can have the smoothing take 10 minutes for one data set, only to have it take 7+ hours for the next data set. I have not found that restarting the process either with or without restarting both SPM12 and Matlab to be at all helpful in resolving this problem.
The only thing that has changed on my system from last week to this week has been renewing my Matlab 2014b license. Any suggestions would be helpful, as this problem is beginning to occur more often than not, making it almost impossible to continue to use SPM12 to preprocess any data.
Thanks in advance,
suzanne
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