MATLAB Answers

Removal of values from cell arrays

1 view (last 30 days)
lucksBi
lucksBi on 15 Mar 2018
Commented: lucksBi on 16 Mar 2018
HI I have following arrays:
before={[2,3,4,5,6];[3,4,5,6,7,8];[5,6,7,8]}
after={[5,6];[4,8];5}
I got 'after' array after some calculations which removed some values from 'before' array Now I have another array X(3x7 cell array):
X= {0,1,0,0.9,0.3,[],[]; 0,0.8,0,0,-1,0.6,[]; 1,0.3,0,-0.4,[],[],[]} % [] at end of each cell were added to make it a square matrix.
In X i have got corresponding values for each value in 'before' array. Like 0 is for 2 in before{1,1}. 1 is for 3 in before{1,1}. Similarly for before{2,1} and before{3,1} I have corresponding values in X.
I want to remove those values from X whose corresponding value is removed from 'before'. Like in before{1,1} 2,3,4 are removed so 0,1,0 will be removed from X{1,1} and so on. Final resuly may look like this:
Result= {0.9,0.3; 0.8,0.6; 1,[]}
kindly help

  0 Comments

Sign in to comment.

Accepted Answer

Bob Nbob
Bob Nbob on 15 Mar 2018
Is it possible for you to rearrange X to be 3x1 array of matrices like before and after? If so then you can use the following:
for rows = 1:size(before,1);
locations = ismember(before{rows},after{rows});
results(rows) = X{rows}(locations==1);
end
If you can't reorganize X it's going to be a bit more difficult, but let me know.

  8 Comments

Show 5 older comments
lucksBi
lucksBi on 16 Mar 2018
Yes got it. X is like this now:
X = {[0,1,0,0.9,0.3];[0,0.8,0,0,-1,0.6];[1,0.3,0,-0.4]}
but error is still here:
Subscripted assignment dimension mismatch.
results(rows) = X{rows}(locations==1);
Jan
Jan on 16 Mar 2018
results{rows} = X{rows}(locations)
lucksBi
lucksBi on 16 Mar 2018
Solved.. Thanks alot @Jan Simon & @Bob Nbob

Sign in to comment.

More Answers (1)

KL
KL on 16 Mar 2018
If all your arrays have consistent dimension, it's a lot simpler. Not very different from the other answer though, just with cellfun,
before={[2,3,4,5,6];[3,4,5,6,7,8];[5,6,7,8];[]}; %added an empty cell
after={[5,6];[4,8];5;[]}; %added an empty cell
%modified X with the same size
X= {[0,1,0,0.9,0.3]; [0,0.8,0,0,-1,0.6]; [1,0.3,0,-0.4];[]}
%now here you get what you want
idx = cellfun(@(x,y) ismember(x,y),before,after,'uni',0);
XX = cellfun(@(x,y) x(y),X,idx,'uni',0)

  1 Comment

lucksBi
lucksBi on 16 Mar 2018
yes it also resolves problem.. Thank You so much for your time.

Sign in to comment.

Tags

Community Treasure Hunt

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

Start Hunting!

Translated by