Chap vector to matrix with special structure.
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I have a collumn vector consisting of n elemtents (size nx1):
P=[P1 ..... Pn]'
What I which to do, is transform this into a matrix with a certain number of rows. This is best explained by an example e.g. k=3 rows:
M=
P1 P2 ... Pn-2
P2 P3 ... Pn-1
P3 P4 ... Pn
Or k=4 rows
M=
P1 P2 ... Pn-3
P2 P3 ... Pn-2
P3 P4 ... Pn-1
P4 P5 ... Pn
In general
M=
P1 P2 ... Pn-k+1
P2 P3
. .
. .
Pk Pk+1 ... Pn
I hope my point is clear and you can help me. I'm performing this operation such that I can perform a multiplication more efficiently.
Thank you guys in advance!
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Accepted Answer
More Answers (1)
Sean de Wolski
on 8 Mar 2012
P = [1 2 pi 5 exp(1)];
idx = 1:ceil(numel(P)./2);
PP = P(bsxfun(@plus,idx',idx-1))
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