can you fix this matrix?

1 次查看（过去 30 天）

Tia 2013-4-20

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:

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

Walter Roberson 2013-4-20

Why are you re-assigning m(1,1) during each iteration of the "for" loop?

Walter Roberson 2013-4-20

m = -ones(4);
m(1,1) = 1;

Tia 2013-4-21

it works.. thank you

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