Hi Tianwen,
I'll give you the Matlab formula, as the bash formula in the pipeline is
not as easy to follow:
mvm = load('Movement_Regressors.txt');
for i=1:6
a = mvm(:,i);
d = [a(2)-a(1);(a(3:end)-a(1:end-2))/2;a(end)-a(end-1)]
matlabD(:,i) = d;
end
You can compare matlabD to mvm(:,7:12).
Peace,
Matt.
On 3/12/13 2:04 PM, "Tianwen Chen" <[email protected]> wrote:
>Hello,
>
>I am wondering whether anyone knows how the temporal derivative motion
>regressors are calculated for the Movement_Regressors.txt file. I
>manually computed the derivatives by applying backward difference on
>the first 6 regressors but found out that they were not matched to the
>second 6 regressors (not even close) in the file.
>
>Thanks,
>Tianwen
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