index info for CAT

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xplore29
xplore29 2014-8-11
评论： Azzi Abdelmalek 2014-8-11
I am concatenating vectors x1,x2,x3 using y=cat(2,x1,x2,x3). Each one of these vectors have different lengths. I need to keep track index information for each one of them. How can I do this without loops.
x1=[1 1 0 1]; x2=[1 0]; x3=[1 1 1];
y=cat(2,x1,x2,x3);
= [1 1 0 1 1 0 1 1 1]
index = [1 4;5 6;7 9]

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Azzi Abdelmalek
Azzi Abdelmalek 2014-8-11
编辑：Azzi Abdelmalek 2014-8-11
index=reshape(cumsum([1 numel(x1)-1 1 numel(x2)-1 1 numel(x3)-1]),2,[])'
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Azzi Abdelmalek
Azzi Abdelmalek 2014-8-11
Instead of using 3 variables x1,x2 and x3 you can use a single variable
x={[1 1 0 1];[1 0];[1 1 1]} % x is a cell array
you can get your three variables
x{1}
x{2}
x{3}
% Now you can get y
y=cell2mat(x')
out=reshape(cumsum([1 numel(x1)-1 1 numel(x2)-1 1 numel(x3)-1]),2,[])'

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