If -metric-stats produces more than one number, then the input file had more than one map.
Tim On Fri, Jun 8, 2018 at 4:16 AM, Xinyang Liu <[email protected]> wrote: > Dear Tim, dear Glasser, > > Thank you very much for your answers. That's very clear to me now. :) > > By the way, I also have a question when counting the vertex number of > surface ROIs (.func.gii) using the wb_command -metric-stats -reduce SUM. Among > around 200 subjects, there are two subjects whose vertex number outcomes > are two sum values (e.g. 63 97 in a column), which is strange. Do you know > the possible reason for that? Thanks. > > Best regards, > Xinyang > > > At 2018-06-08 05:15:36, "Timothy Coalson" <[email protected]> wrote: > > A picture is worth a thousand words, so here is a single subject 32k fs_LR > surface, rendered to show edges between vertices, showing the variable > spacing (you can check this on other surfaces by loading them in wb_view, > and going to the Surface menu, clicking Properties, and setting "Drawin > Type" to "Links (Edges)". > > In short, you shouldn't think of vertices like you do voxels, they don't > use a fully regular grid. This is why wb_command spatial operations take > nearly all distances in mm, not in neighbors. > > Tim > > > On Thu, Jun 7, 2018 at 10:48 AM, Glasser, Matthew <[email protected]> > wrote: > >> On a standard mesh anatomical surface the vertex spacing is non-uniform >> across the surface. If you used the spheres you could get a uniform number >> of vertices (though now the patches would cover different total areas). >> Probably the uniform in mm approach (on the midthickness with appropriate >> correction for shrinkage by vertex areas) is what you want. >> >> Peace, >> >> Matt. >> >> From: <[email protected]> on behalf of Xinyang Liu < >> [email protected]> >> Date: Thursday, June 7, 2018 at 8:33 AM >> To: HCP 讨论组 <[email protected]> >> Subject: [HCP-Users] wb_command -metric-rois-from-extrema >> >> Dear HCP experts, >> >> Hi. I have some confusions when using the workbench command >> *-metric-rois-from-extrema*. When using it to draw ROIs on the fMRI >> surface, I found that with the same radium, the number of vertices inside >> the ROI can be different in different locations. For example, when r=5mm, >> the vertex number can range from around 30 to around 80. Maybe I do not >> understand very well about the parameter <limit> - geodesic distance >> limit from vertex, in mm. My understanding is that the distance is the >> radium around the extrema on the stretched surface, and the vertex numbers >> should be the same after the radium is set. Where do I misunderstand? >> >> Look forward to any kind guidance. Thanks a lot. >> >> Best regards, >> Xinyang >> >> >> >> >> >> _______________________________________________ >> HCP-Users mailing list >> [email protected] >> http://lists.humanconnectome.org/mailman/listinfo/hcp-users >> >> _______________________________________________ >> HCP-Users mailing list >> [email protected] >> http://lists.humanconnectome.org/mailman/listinfo/hcp-users >> > > > > > _______________________________________________ HCP-Users mailing list [email protected] http://lists.humanconnectome.org/mailman/listinfo/hcp-users
