Matrix caculation about NAN and IFN

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Jialin Men
Jialin Men 2022-6-27
评论： Jialin Men 2022-6-27
Hello everyone,
I have a question about Matrix cacluation.
I have two Matrix as follows:
C =A./B
so the elements from A divided by B element . than I get NAN and IFN.
How to ignore them?
Many many Thanks
JM

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Karim
Karim 2022-6-27
编辑：Karim 2022-6-27
Ran in:
you can use indexing to avoid deviding by zero:
A = [1 0 0; 1 1 0; 3 4 2; 2 3 1];
B = [1 0 2;1 0 14; 0 1 11; 1 1 10];
C = zeros(size(A));
% find indexes of non zero locations
B_logi = B ~=0;
C(B_logi) = A(B_logi) ./ B(B_logi);
% display result
C
C = 4×3
1.0000 0 0 1.0000 0 0 0 4.0000 0.1818 2.0000 3.0000 0.1000
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Karim
Karim 2022-6-27
Ran in:
A = [1 0 0; 1 1 0; 3 4 2; 2 3 1];
B = [1 0 2;1 0 14; 0 1 11; 1 1 10];
C = zeros(size(A));
% find indexes of non zero locations
B_logi = B ~=0;
C(B_logi) = A(B_logi) ./ B(B_logi);
% find indexes of non zero locations
C_logi = C ~=0;
C_nonzero = C(C_logi)
C_nonzero = 7×1
1.0000 1.0000 2.0000 4.0000 3.0000 0.1818 0.1000
histfit( C_nonzero(:) )
Jialin Men
Jialin Men 2022-6-27
Thank you so much.
It really help me solve a big problem.
Many Many Thousands Thanks

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