Find row(s) of 3x3 matrix where the 1st and 2nd column equals a value

Hi

I have a 3x3 matrix, and i would like to find the rows where the 1st and 2nd columns equals a value.

M=[1 2 3

1 1 3

2 1 3]

Lets say I would like to find the row where both the 1st and 2nd column equals 1. In this case i would like to find row 2, and be able to extract the values of that row, i.e. 1 1 3.

Answer 1

[Sriram Tadavarty]

Hi,

Try this:

out = M(M(:,1)==1 & M(:,2)==1,:); % For the example provided with value 1

% For any generic value
out = M(M(:,1)== M(:,2),:);

Hope this helps.

Regards,

Sriram

[Sebastian Daneli]

Thanks, this is what I call customer service

Answer 2

[Ameer Hamza]

M = [1 2 3
     1 1 3
     2 1 3];
 
idx = M(:,1)==M(:,2);
M_new = M(idx,:);

Result:

>> M_new
M_new =
     1     1     3

[Sebastian Daneli]

Thanks