if statement with and or

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Marco Lepidi
Marco Lepidi 2021-12-28
评论： Marco Lepidi 2021-12-28
Ran in:
Hi sorry, i want to create a code to know if a generic matrix A is positive definite. On my version of matlab (2016) when i write the second & the code gives me an error saying that "Matrix dimensions must agree". Can you help me?
A=[13/4 1/2 0; 1/2 17/4 1/2; 0 1/2 21/4]
A = 3×3
3.2500 0.5000 0 0.5000 4.2500 0.5000 0 0.5000 5.2500
[n,m]=size(A);
D_A=diag(A);
M_A=A-diag(D_A);
if n==m & A==A' & (abs(D_A)>sum(abs(M_A),2) | abs((D_A)')>sum(abs(M_A),1)) & diag(A)>0
disp 'A è DEFINITA POSITIVA'
end
A è DEFINITA POSITIVA
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Voss
Voss 2021-12-28
isequal is for comparing arrays (especially non-scalar arrays). all is for checking a condition on elements of an array.

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