how can convert vector to array

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fathi
fathi 2015-8-23
评论： Walter Roberson 2015-8-23
how can convert vector to array ; Ex:
a = [ 1 2 3 ];
i like to convert it to :
d = [ 1 0 0;
0 2 0;
0 0 3;
1 2 0;
1 0 3;
0 2 3;
1 2 3 ];
thanks
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Walter Roberson
Walter Roberson 2015-8-23
In a duplicate question, the poster asked
Ex:
w = [ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ]
I like to convert it to
g= [1 0 0 0 0 0 0 0 0 0 0 0 0 0 0;
0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 ;
0 0 3 0 0 0 0 0 0 0 0 0 0 0 0;
0 0 0 4 0 0 0 0 0 0 0 0 0 0 0 ;
......until......... ;
0 0 3 4 5 6 7 8 9 10 11 12 13 14 15;
0 2 3 4 5 6 7 8 9 10 11 12 13 14 15;
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15]
that mean I have , rows=2^(2n-1) I got answer from _ the cyclist_ http://www.mathworks.com/matlabcentral/answers/235359-how-can-convert-vector-to- array . it was good answer, but it was active until 5 elements [ 1 2 3 4 5 ]. thank you - the cyclist _

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回答（1 个）

the cyclist
the cyclist 2015-8-23
If the exact ordering is not important, then you could do
P = perms([1 2 3 0 0])
Q = unique(sort(P(:,1:3),2),'rows')

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