arrange indices

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huda nawaf
huda nawaf 2012-4-28
hi, if i have this vector
r=[2 4 18 5 6 15 3 4 16]; i need arrange index 3,6,9 with ascending, and each both previous index are arranged according for that as:
r=[5 6 15 3 4 16 2 4 18]; i.e just 3,6,.....are arranged with ascending and the index befor it are arranged according to third , sixth,..... i would to say ,this is just example i have too long vector

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Andrei Bobrov
Andrei Bobrov 2012-4-28
[ii,ii] = sort(r(3:3:end));
out = reshape(r(bsxfun(@plus,ii*3,(-2:0)')),1,[]);
OR:
out = reshape(sortrows(reshape(r,3,[])',3)',1,[]);
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huda nawaf
huda nawaf 2012-4-28
what if need that
ex. r=[1 2 4 18 5 6 15 3 4 16];
if need 1 in same index and the other values as:
r=[1 5 6 15 3 4 16 2 4 18];
what will be changed in this command?
out = reshape(sortrows(reshape(r,3,[])',3)',1,[]);
Andrei Bobrov
Andrei Bobrov 2012-4-29
out = [r(1),reshape(sortrows(reshape(r(2:end),3,[])',3)',1,[])];

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