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From: Stefano on 4 Oct 2009 12:12
% Gauss elimination to invert A
temp = [A,eye(N)];

% forward
for i = 1:N
% if the current row does not have a 1 in column i, find a row j >
% i with a 1 in column i and add it to row i
if temp(i,i) == 0
% some code here
end
% forward gauss elimination
for j=i+1:N
if temp(j,i)
% code here...
end
end
end
% backward
for i=N:-1:2
for j=i-1:-1:1
if temp(j,i)
% some more code here...
end
end
end
invA = temp(:,N+1:end);

OK?



"Mostafa " <mmmedra(a)yahoo.com> wrote in message <haaf7d$edk$1(a)fred.mathworks.com>...
> "Stefano " <s.mangione(a)gmail.com> wrote in message <h9tqtt$njm$1(a)fred.mathworks.com>...
> > No, I'm really speaking about the binary one :)
> > Don't use the xor() function, it's very slow, use mod( ,2) instead.
> >
> > Stefano
> >
> > "Mostafa " <mmmedra(a)yahoo.com> wrote in message <h9tokq$ir6$1(a)fred.mathworks.com>...
> >
> > > you are speaking about the inversion of the normal matrix , I am speaking about the binary one.
>
>
> How then ?
>
> could you write a some code?
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