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oops! I mean avscale :) -P On Wed, May 16, 2012 at 1:29 PM, Paul Robinson <[log in to unmask]>wrote: > Hi, Emily. > > Have you looked into avwscale? It will output the halfway transform for > you, if that's what you're after. > > hth, > Paul > > > On Wed, May 16, 2012 at 9:32 AM, Emily Coffey <[log in to unmask]>wrote: > >> Hi, >> >> I am trying to find the midpoint of a rigid body registration between two >> consecutive scans. Thomas et al., 2009 have done this previously, and >> provide the description: "the halfway point was determined by taking the >> square root of the alignment transformation (rigid, 6 DOF)". >> >> I tried using the -sqrt option in fslmaths but this appears to be >> designed to handle volume data rather than transformation matrices. I >> thought it might be doable manually using MatLab's matrix capability but >> the format does not seem to be appreciated by MatLab. >> >> Ideas? >> >> E. >> > >