Matching matrices based on two columns

6 views (last 30 days)
I have two matrices A and B, I am trying to match these by 2 columns of B and when they dont match instert Nan as fill value
A=
1 0.1 0.22 5 82 855
2 0.22 0.23 58 8 888
31 0.23 0.25 55 5 958
95 0.25 0.28 55 8 97
99 0.29 0.51 33 52 55
and B= (this contains some elements from column 2 and 3 of matrix A
0.01 0.02
0.1 0.22
0.22 0.23
0.23 0.25
0.25 0.28
0.28 0.29
0.29 0.51
I am trying to have a matrix as follows
NaN 0.01 0.02 NaN NaN NaN
1 0.1 0.22 5 82 855
2 0.22 0.23 58 8 888
31 0.23 0.25 55 5 958
95 0.25 0.28 55 8 97
NaN 0.28 0.29 NaN NaN NaN
99 0.29 0.51 33 52 55
  1 Comment
SChow
SChow on 14 Jul 2021
Edited: SChow on 14 Jul 2021
I tried the following, the error says "The logical indices in position 1 contain a true value outside of the array bounds."
i=ismember(B,A(:,3:4));
A(i,:)

Sign in to comment.

Accepted Answer

Simon Chan
Simon Chan on 14 Jul 2021
Edited: Simon Chan on 14 Jul 2021
col=size(A,2);
row=size(B,1);
C = nan(row,col);
[~,idx] = ismember(B,A(:,2:3),'rows');
idx2=find(idx~=0); % Index for Member
idx3=find(idx==0); % Index for Non-member
idx(idx==0)=[];
C(idx2,:)=A(idx,:);
C(idx3,2:3)=B(idx3,:)
C is the result.

More Answers (0)

Categories

Find more on Matrices and Arrays in Help Center and File Exchange

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!