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.
