can you fix this matrix?

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Tia
Tia on 20 Apr 2013
m=ones(4);
x=-1;
for i=1:3;
m(1,1)=-x;
m(1,1+i)=x;
m(2:end,1:end)=x;
end
i want to make it's shorter and easier. can you fix it?
example:
[1 1 1 1
1 1 1 1
1 1 1 1
1 1 1 1]
i want the output will be
[1 -1 -1 -1
-1 -1 -1 -1
-1 -1 -1 -1
-1 -1 -1 -1]
thank you very much
  1 Comment
Walter Roberson
Walter Roberson on 20 Apr 2013
Why are you re-assigning m(1,1) during each iteration of the "for" loop?

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Accepted Answer

Walter Roberson
Walter Roberson on 20 Apr 2013
m = -ones(4);
m(1,1) = 1;

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