I'm using imref3d to help me register 2 images together. Currently, I am using 2013a which works wonderfully. Due to the large dataset I'm trying to use the university's computer cluster to more quickly process my data. However, I need to use 2012b to use the cluster and I'm getting an error with the imref3d command. Is this do to a change from 2012b to 2013a? Or is it some other syntax error?