What is a function that takes the diagonal of a matrix (N) and converts the diagonal to all zeros.

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Sean
Sean 2013-4-9
Ex.
>> m=[1 2 3; 4 5 6;1 2 3]
m =
1 2 3
4 5 6
1 2 3
>> m=diagzero (m)
m =
0 2 3
4 0 6
1 2 0

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采纳的回答

Youssef Khmou
Youssef Khmou 2013-4-9
try :
function Y=diagzero(X)
N=size(X);
if N(1)~=N(2)
error(' Matrix not square');
end
Y=X;
for x=1:N(1)
Y(x,x)=0;
end

更多回答（4 个）

James Tursa
James Tursa 2013-4-10
编辑：James Tursa 2013-4-10
Another method if you know m is square:
r = size(m,1) + 1;
m(1:r:end) = 0;
If you don't know if m is square or not you could do this:
r = size(m,1);
n = min(numel(m),r*r);
m(1:r+1:n) = 0;
Andrei Bobrov
Andrei Bobrov 2013-4-10
m(eye(size(m))>0) = 0;
Azzi Abdelmalek
Azzi Abdelmalek 2013-4-9
编辑：Azzi Abdelmalek 2013-4-9
ii=1:size(m,1);
m(sub2ind(size(m),ii,ii))=0
Jonathan Epperl
Jonathan Epperl 2013-4-10
编辑：Jonathan Epperl 2013-4-10
Assuming m is square (because else you'd have to define the diagonal for me):
diagzero = @(m) m - diag(diag(m));

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