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Christian, This is going back a few weeks ago. I am attempting to identify the independent components in a group of images. This is the error I get after using avwmerge: Starting PCA ... An exception has been thrown Runtime error:- detected by Newmat: process fails to converge MatrixType = Diag # Rows = 2; # Cols = 2; lower BW = 0; upper BW = 0 Trace: Evalue(tql2). Does this imply that the independent components cannot be identified? Regards, DJ Christian Beckmann <[log in to unmask]> wrote: > DJ > > time series analysis requires time series - all our functional tools work > on 4D files. It seems that you've been trying to run it on a single 3D > volume: > > >Melodic Version 2.0 > > > >Melodic results will be in /home/norm_volumes_1/nepi_vol_0002.ica > > > >Reading data file filtered_func_data ... done > >Create mask ... done > >Excluding voxels with constant value > >Data size : 1 x 510340 > > You will need to create a 4d file first (avwmerge -t does this). If the > file should have been 4D already, check the header information (avwhd) to > see why it appears as a 3d volume > > ta > c