problem in inserting a diagnol

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k.v.swamy
k.v.swamy 2012-7-12
hi, i have a problem in inserting the diagnol of a matrix. i have a=[1 2 3;4 5 6;7 8 9] in which i have to extract the diagnol by multiplying with 2 and i want to again insert the diagnol i,e iwant to have [2 2 3;4 10 6;7 8 18]; i dont want to use the loop.
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Yash
Yash 2012-7-12
how do u want the output to be
San
San 2012-7-12
he want to have double for diagonal but don't want loop :(

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回答（1 个）

Conrad
Conrad 2012-7-12
A = [ 1 2 3;...
4 5 6;...
7 8 9];
A(1:(length(A)+1):numel(A)) = 2*diag(A);

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