Ismember to replace value in vector?

Hi

I have created matrix B, see a cut out below (it is actually 260 rows long). Matrix A is the result of calculation (also here a cut out since it is 8637 rows long).

Now I want to find where the rows of B are found in A. I use ismember for this, but the problem is that ismember gives me the value 1. I want ismember to find the index like this, but to give it the same number as the row.

I did this:

B=[0 1 1; 0 1 2; 0 1 3]; 
A=[0 1 4; 0 2 4; 0 1 2; 0 1 5; 0 1 3]; 
output=zeros(5,1);
out1 = ismember(A,B(1,:),'rows')
out2 = ismember(A,B(2,:),'rows')
out3 = ismember(A,B(3,:),'rows')

I would like my function to return:

new_output => [0; 0; 2; 0; 3]

Later I will have to loop this 260 times (for each row), but for now I need to find a way to assign a value to each index.

Any suggestions on how to do this?

Thank you in advance

Answer 1

[Stephen23]

Read the ismember help, the second output is all you need:

>> [~,idx] = ismember(A,B,'rows')
idx =
   0
   0
   2
   0
   3
>>

This is why we tell people to read the help for every function that they use.

[Jona]

Thank you, Stephen! It works. I will read the help more carefully next time. I just assumed that ismember was not the correct function, so I was already looking for something else.