Efficient reordering of vector
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I would like to reorder vector as following:
a = [1 2 3 4 5 6 7 8 9 10 11 12]
to
r = [1 5 9 2 6 10 3 7 11 4 8 12]
what would be efficient way of doing so?
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Walter Roberson
2015-12-3
reshape( reshape(a, 4, 3).', 1, [])
3 个评论
Guillaume
2015-12-3
or more generically
reshape(reshape(a, [], stride).', 1, [])
Walter Roberson
2015-12-3
In that line, "stride" would have to mean the number of elements in each sub-group. I tend to instead think of stride in terms of the difference between adjacent indices, and for that you would use
reshape(reshape(a,stride,[]).' 1, [])
Guillaume
2015-12-3
That is also what I meant, but... brain did not engage properly.
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