repeat rows in a matrix based on values in one column

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Masih Alavy
Masih Alavy 2019-2-23
回答： dpb 2019-2-24
Hello All,
I have a matrix which is attached here. Here is what I want to do: I want to make a duplicate of rows whose first column values are the same and then put the duplicate right beneath when the value of the first column changes. I have put a picture for portion of the final file that I want. Thanks for your help.

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dpb
dpb 2019-2-24
u=unique(x(:,1),'stable'); % get the unique values in first column to work over; keep original order
xx=[];
for i=numel(u):1
ix=find(x(:,1)==u);
xx=[xx;repmat(x(ix,:),2,1)]; % build the new output array
end
"Deadahead" to just copy the sections to a new file; if not _terribly large x the dynamic reallocation shouldn't be too bad.

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