a simple substitution problem !

2 次查看（过去 30 天）
YI Hsu Lo
YI Hsu Lo 2013-2-19
i have a 2x2 matrix
u = [ 10 10 ; 5 5 ] ; for example
how can i use a simple code to transfer it to
u =
[ 0.5 10 ; 5 0.5 ]
i use
subs ( diag(u) , 0.5 );
but it didn't work
please help me with the problem!!!
thank you!

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回答（3 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-2-19
编辑：Azzi Abdelmalek 2013-2-19
Edit
u = [ 10 10 ; 5 5 ];
y=u(:);
n=size(u,1);
y((1:n).^2)=0.5;
out=reshape(y,n,n)
José-Luis
José-Luis 2013-2-19
a = rand(10);
[m n] = size(a);
a(1:m+1:numel(a)) = 0.5;
Andrei Bobrov
Andrei Bobrov 2013-2-19
a = rand(10);
a(eye(size(a))>0) = 0.5;

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