Dear Doug, I just want to let you know that your solution works perfectly. All the vertices were successfully mapped into the brainspace via MRIwrite and visualized as an "overlay" after selection of the appropriate colormap and thresholds. Thank you very much for your help! --- Regards, Alex
* Alexander Lebedev <awl...@rambler.ru> [Tue, 31 Jan 2012 01:50:03 +0400]: > Hello Doug! > Thank you so much! > Sorry, I've just noticed a mistake... My matrix is 327684x2: the 1st > column denotes vertex numbers and the 2nd one contains corresponding > regression coefficients... I will try to display this tomorrow... > Probably, I will have some troubles with this, considering that there > are both positive and negative coefficients... But I will try. > --- > Regards, > Alex > > > * Douglas N Greve <gr...@nmr.mgh.harvard.edu> [Mon, 30 Jan 2012 10:27:36 > -0500]: > > Hi Alex, > > we don't have an elegant solution to this, but you can do it in matlab > > easily enough. If your data D are in a N-by-327684 matrix (I assume > that > > this is left and right hemis), then > > > > a.vol = permute(D(:,1:163842),[2 3 4 1]); > > MRIwrite(a,'lh.yourdata.mgh'); > > > > b.vol = permute(D(:,163843:end),[2 3 4 1]); > > MRIwrite(b,'rh.yourdata.mgh'); > > > > doug > > > > > > > > > > Alexander Lebedev wrote: > > > Excuse me for disturbing Douglas, > > > > > > The matter is that I have the coefficients for each vertex and I > would > > > like to find the easiest way to display them into the brain space, > > > showing their importance for the classification. My original ascii > > > file contains N-by-327684 matrix (N subjects, 327 684 vertices - 163 > > > 842 for each hemisphere). But I can easily change it if necessary... > > > I'm just wondering if there is a way to do this... I'm asking > because > > > it seems like "y.mgh -> y.asc" (mri_convert y.mgh y.ascii --ascii) > > > conversion is available only one-way. > > > --- > > > Regards, > > > Alex > > > > > > > > > * Alexander Lebedev <awl...@rambler.ru> [Fri, 27 Jan 2012 10:07:11 > > > +0400]: > > >> Yes, sorry... > > >> --- > > >> Alex > > >> > > >> > Hi Alex, I'm not sure I understand what you mean. Do you mean > that > > > you > > >> > have a coefficient for each vertex and you want to display your > > >> results > > >> > on a surface and need to get them into a format that FS can read? > > >> > doug > > >> > > > >> > Alexander Lebedev wrote: > > >> > > Yes, thanks a lot Douglas! That's what I was looking for. And > > it's > > >> > > much easier than my approach... I needed to extract the > vertices > > > in > > >> > > order to perform a multivariate analysis in R. May I also ask > > >> another > > >> > > question then? I have performed pls-regression and would like > to > > > map > > >> > > the coefficients into the brain space... Is there such an > > >> opportunity > > >> > > (at least theoretically speaking) ? > > >> > > --- > > >> > > Regards, > > >> > > Alex > > >> > > > > >> > > > > > > > > > > _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
