Swapping elements from one matrix to another.

Question

shahzer rahman 2020-3-2

编辑： KSSV 2020-3-2

Hi all. I am relatively new in Matlab.

Suppose i have two matrices A= [1 2 3 -4 5 -6 8 9 10 -5 -4 -2]' and B=[12 2 3 4 5 6 -7 9 6 4 5 -1]'. Both of them are of the same order.

I want to replace the negative values in A with the corresponding values of B( the same index values).

Expected updated A = [1 2 3 4 5 6 8 9 10 4 5 -1]'.

Kindly help.

Jintao Wu 2020-3-2

I am also new here .Now let me exchange something about the MATLAB . You can do it like this ,

[a1,a2]=find(A<0);

A[a1,a2]=B[a1,a2];

You can use the 'find' function . After that , you can try it to complete the similar issues .

Congratulations

Answer 1

KSSV 2020-3-2

编辑：KSSV 2020-3-2

Read about logical indexing.

A(A<0) = B(A<0) ;