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Index Matrix A and Matrix B Problems

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jane
jane 2022-6-24
编辑： Dhritishman 2022-7-3
i have matrix A and Matrix B
A = [[ 0, 1, 1, 0, 1, 0,1],
[ 0, 0, 1, 1, 0, 0,0],
[ 1, 1, 0, 1, 1, 0,0]],
B = [[ 234, 59, 15, 99, 61, 74 ,71],
[ 16, 27, 14, 13, 111, 345.67],
[ 54, 23, 16, 14, 13, 27,100]],
How to make the value in matrix B be 0 if the value in matrix A is 1.
For example, in matrix A (row 1, column 2), the value of 1 in matrix B (row 1, column 2) will be 0.
I tried using loop but it didn't work. Thank you

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回答（3 个）

James Tursa
James Tursa 2022-6-24
编辑：James Tursa 2022-6-24
You can use logical indexing:
B(A==1) = 0;
You can use a loop for this also, but you would have to show us the code you used before we can tell you what you did wrong with that approach.
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James Tursa
James Tursa 2022-6-24
If on the other hand you want the A==1 spots to contain original B values and the other spots to become zero, then simply change the comparison operator used from "equals" to "not equals":
B(A~=1) = 0;

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Voss
Voss 2022-6-24
Ran in:
A = [ 0, 1, 1, 0, 1, 0,1; 0, 0, 1, 1, 0, 0,0; 1, 1, 0, 1, 1, 0,0]
A = 3×7
0 1 1 0 1 0 1 0 0 1 1 0 0 0 1 1 0 1 1 0 0
B = [ 234, 59, 15, 99, 61, 74 ,71; 16, 27, 14, 13, 111, 345,67; 54, 23, 16, 14, 13, 27,100]
B = 3×7
234 59 15 99 61 74 71 16 27 14 13 111 345 67 54 23 16 14 13 27 100
B(A == 1) = 0
B = 3×7
234 0 0 99 0 74 0 16 27 0 0 111 345 67 0 0 16 0 0 27 100
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Dhritishman
Dhritishman 2022-7-3
编辑：Dhritishman 2022-7-3
Ran in:
MATLAB provides logical indexing which can be used to select or modify elements of a matrix.
A = [0, 1, 1, 0, 1, 0, 1; 0, 0, 1, 1, 0, 0,0; 1, 1, 0, 1, 1, 0,0]
A = 3×7
0 1 1 0 1 0 1 0 0 1 1 0 0 0 1 1 0 1 1 0 0
B = [234, 59, 15, 99, 61, 74, 71; 16, 27, 14, 13, 111, 345, 67; 54, 23, 16, 14, 13, 27, 100]
B = 3×7
234 59 15 99 61 74 71 16 27 14 13 111 345 67 54 23 16 14 13 27 100
% This line of code changes the value in matrix B to 0 if the value of the corresponding element in matrix A is 1.
B(A == 1) = 0
B = 3×7
234 0 0 99 0 74 0 16 27 0 0 111 345 67 0 0 16 0 0 27 100

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