Reshape matrix with zero value

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Francesco
Francesco 2014-2-22
回答： Andrei Bobrov 2014-2-22
I have this variable formatted as following:
>> dist
dist =
0 7.5000 15.0000 16.7705 21.2132 16.7705 15.0000 7.5000
7.5000 0 7.5000 10.6066 16.7705 15.0000 16.7705 10.6066
15.0000 7.5000 0 7.5000 15.0000 16.7705 21.2132 16.7705
16.7705 10.6066 7.5000 0 7.5000 10.6066 16.7705 15.0000
21.2132 16.7705 15.0000 7.5000 0 7.5000 15.0000 16.7705
16.7705 15.0000 16.7705 10.6066 7.5000 0 7.5000 10.6066
15.0000 16.7705 21.2132 16.7705 15.0000 7.5000 0 7.5000
7.5000 10.6066 16.7705 15.0000 16.7705 10.6066 7.5000 0
I have just posted this question before but I'm not quite clear in the explatation. I want to obtain a 8x7 matrix because I want to eliminate all the 0 element rows by rows. How can I do this?
It should be a matrix like this:
7.5000 15.0000 16.7705 21.2132 16.7705 15.0000 7.5000
7.5000 7.5000 10.6066 16.7705 15.0000 16.7705 10.6066
15.0000 7.5000 7.5000 15.0000 16.7705 21.2132 16.7705
and so on.
Is it possible to do this thing?

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采纳的回答

Mischa Kim
Mischa Kim 2014-2-22
Looks like you just want to remove the diagonal elements. Check out this answer.
  2 个评论
Francesco
Francesco 2014-2-22
Do you think that this code is good?
function Z=diagrem(X)
N=size(X);
Z=X;
if N(1)~=N(2)
error('Matrix is not square');
end
for x=1:N(1)
Z(x,x)=0;
end
for y=1:N(1)-1
Z(y,y+1)=0;
end
Z(Z==0)=[];
Z=reshape(Z,N(1)-1,N(2)-1);
The problem is that MATLAB said:
??? function Z=diagrem(dist) | Error: Function definitions are not permitted at the prompt or in scripts.
Francesco
Francesco 2014-2-22
b=triu(a)
b=b(:,2:end)
c=tril(a)
c=c(:,1:end-1)
b+c
This code seemns to work fine. Do you think so?

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更多回答（1 个）

Andrei Bobrov
Andrei Bobrov 2014-2-22
n = size(dist1);
out = zeros(n-[1 0]);
out(:)=dist(~eye(n));
out = out';

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