GIFTI is really only for single structures.  CIFTI is for combinations across 
structures.  Perhaps you should create a CIFTI file with wb_command 
-cifti-create-dense-timeseries.

Peace,

Matt.

From: 
<[email protected]<mailto:[email protected]>>
 on behalf of Rita Elena Loiotile 
<[email protected]<mailto:[email protected]>>
Date: Tuesday, October 24, 2017 at 2:05 PM
To: "[email protected]<mailto:[email protected]>" 
<[email protected]<mailto:[email protected]>>
Subject: [HCP-Users] Merging a gifti file

Hi,

I'd like to merge two gifti files, each of format 32K x t timepoints.
I'd like the output to be 64K x t timepoints, so basically concatenating the 
first dimension.
My understanding is that wb_command -metric-merge doesn't acomodate this.  Is 
there anything else I can try?
I tried converting to nifti format and using "fsl_merge -x" (which does do what 
I'd like, but unfortunately caps the number of items in the each dimension to 
well below 64K).

Thank you kindly in advance,
Rita

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