How do I make the element zero, if its adjacent column element is zero?
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Hello,
Assume, I have the following 9x2 matrix. When there is a zero in the second column, I want to make the first column's same row element zero too.
12 0
11 0
10 6
12 0
11 3
10 0
12 0
11 5
10 0
This will become like:
0 0
0 0
10 6
0 0
11 3
0 0
0 0
11 5
0 0
Thank you so much
0 Comments
Accepted Answer
per isakson
on 10 Jul 2016
Edited: per isakson
on 10 Jul 2016
Try
>> is_zero = A(:,2)==0;
>> A(is_zero,1)=0;
>> A
A =
0 0
0 0
10 6
0 0
11 3
0 0
0 0
11 5
0 0
More Answers (1)
Star Strider
on 10 Jul 2016
That can actually be done in one line of code:
M = [12 0
11 0
10 6
12 0
11 3
10 0
12 0
11 5
10 0];
M(M(:,2) == 0,1) = 0
M =
0 0
0 0
10 6
0 0
11 3
0 0
0 0
11 5
0 0
3 Comments
per isakson
on 12 Jul 2016
Edited: per isakson
on 12 Jul 2016
Adding a question in a comment to an existing question with an accepted answer doesn't attract many viewers. I think it is better to open a new question.
I have problems understanding your "pseudo indexing".
"Y13 = 1 because Z13 = 1"   Here is a piece of elegant Matlab code. (Not sure it is relevant, though.)
>> A = zeros(3,4,2);
>> B = randi( [1,2], size(A) );
>> A(B==1)=1; % or A(B==1)=B(B==1);
>> B
B(:,:,1) =
2 2 1 2
1 1 1 2
2 2 2 1
B(:,:,2) =
2 1 1 2
1 1 2 1
1 2 1 2
>> A
A(:,:,1) =
0 0 1 0
1 1 1 0
0 0 0 1
A(:,:,2) =
0 1 1 0
1 1 0 1
1 0 1 0
>>
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