selecting many small vectors from large vector at irregular interval
in [Matlab]
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From: Carl on 5 Aug 2010 15:39 Hi, Thanks for reading this post.... I would like to select many small vectors from large vector and store them in a matrix. The small vectors start at irregular intervals so the reshape() function may not be the best function to use. I am currently using a for-loop to do the job but it is extremely slow. Below is an example of what I would like to see: % here is the index noting the start of the data index = [1 4 10 15]; % this is the long vector A = [ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20]; % here is what I would like the Matrix to look like. I'm selecting 2 data points from % the long vector and they start at the index values B = [1 2; 4 5; 10 11; 15 16]; I've been generating B in a for-loop but it is slow. Any tricks to help with this would be greatly appreciated. - Carl
From: Walter Roberson on 5 Aug 2010 15:47 Carl wrote: > Hi, > > Thanks for reading this post.... > > I would like to select many small vectors from large vector and store > them in a matrix. The small vectors start at irregular intervals so the > reshape() function may not be the best function to use. > I am currently using a for-loop to do the job but it is extremely > slow. Below is an example of what I would like to see: > > % here is the index noting the start of the data > index = [1 4 10 15]; > > % this is the long vector > A = [ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20]; > > % here is what I would like the Matrix to look like. I'm selecting 2 > data points from % the long vector and they start at the index values > > B = [1 2; 4 5; 10 11; 15 16]; > > I've been generating B in a for-loop but it is slow. Any tricks to help > with this would be greatly appreciated. A([index(:), index(:) + 1])
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