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Question for command "wb_command -cifti-gradient"
Posted by: yu li
Date: May 19, 2021 02:43AM

Hello, I'm using "wb_command -cifti-gradient" to caulate the gradient of left surface. I don't quite understand the parameter <direction>. Could anyone give suggestions?
In my opinion, if I use COLUMN, that means workbench will caulate gradient for each single column, and this process is independent between columns. Any questions? So I think using the parameter "ROW" or "COLUMN" is depend on what we want to do. For example, if I think the rows of matrix represent vertices and the columns of matrix represent features(e.g, functional connectivity), I should use COLUMN in "wb_command -cifti-gradient". But in the introduction of "wb_command -cifti-gradient", why recommend "ROW" for dconn files and "COLUMN" for dtseries files? Is the consideration between speed and PC memory?
Now, if I have a symmetrical functional connectivity of left surface (32k*32k) , and want to calculate its gradient (then smoothing), how to do? There is my code as fllows:

wb_command -cifti-gradient FC.dconn.nii COLUMN FC_gradient.dconn.nii -left-surface Conte69.L.midthickness.32k_fs_LR.surf.gii
wb_command -cifti-smoothing FC_gradient.dconn.nii 2.55 0 COLUMN FC_gradient_smooth.dconn.nii -left-surface Conte69.L.midthickness.32k_fs_LR.surf.gii

If I use "ciftiopen“ to open the result "FC_gradient_smooth.dconn.nii" in matlab, I could obtain a 32k*32K matrix. So for each sigle column of this matrix, does it represent a gradient with smooth for left surface?

Thanks a lot!

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