Matrix caculation about NAN and IFN

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

Answer 1

[Karim]

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

[JM]

Thousands Thanks. That really help me so much.

I have another question,

if I continue to handle this C data to do Histfit.

so I make C1=C(:)

Hisfit(C1)

So all the 0 will not influnce this Hisfit diagramm right?

Best regards

Jialin

[Karim]

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(:) )

[JM]

Thank you so much.

It really help me solve a big problem.

Many Many Thousands Thanks