how to create nxn matrix with main diagonal that enters odd rows/columns with zero and even ones start with 2(n+1) sequence
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im trying to write a code where even main diagonal entries start off with 2 and continue 4,6,8.... etc but i only get outputs of 2. im assuming my problem is with the n=n+1 counter but im not sure.
my code is = for i=1:30;
For j=1:30;
for i=j
c=1;
if mod(i,2)~0 A(i,j)=2*c c=c+1; if mod (i, 2) ==0
A(i, j)=0;
end
end
end end
end
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답변 (2개)
John D'Errico
2024년 5월 15일
Simple is to use diag.
n = 5; % Now many non-zero elements will we have?
N = 1:(2*n); % a simple index vector
D = N.*mod(N-1,2); % create the elements of the main diagonal
A = diag(D)
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