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
>>
>>
>>
>>
>>
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>
>
>
>
>

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