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Xs = gcat(X)
Xs = gcat(X, dim)
Xs = gcat(X) concatenates the variant arrays X from each lab in the second dimension. The result is replicated on all labs.
Xs = gcat(X, dim) concatenates the variant arrays X from each lab in the dim-th dimension.
With four labs,
Xs = gcat(labindex)
returns Xs = [1 2 3 4] on all four labs.
cat MATLAB function reference page
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