Separating Matrix Rows into two different vectors

2 views (last 30 days)
I have a matrix
A=[1 3 5;1 5 6;3 9 10;3 5 6;1 4 5;3 5 6; 9 6 7; 1 5 8; 3 6 0];
and i would like to seperate in in terms of the 1st element
for example
if A(1,i)==1 then it would a adn if A(1,i)== 3 then it would go into b and i would like A to reduce in size as it goes to one matrix or another.
So when I have the first row after it gets assigned into a vector i want it to be deleted and goes to the next one
so i want my final results to look like
A=[9 6 7]
a=[1 3 5;1 5 6;1 4 5;1 5 8]
b=[3 9 10;3 5 6;3 5 6; 3 6 0]
How would that be done?
And, if I had this condition
A(1)<2 put in a matrix if greater than >2 put in b matrix. and the format would look like this:
A=[9 6 7]
a=[1 3 5;1 5 6;1 4 5;1 5 8]
b=[3 9 10;3 5 6;3 5 6; 3 6 0]
How would it be done?

Accepted Answer

Matt J
Matt J on 23 Jan 2021
Edited: Matt J on 23 Jan 2021
A=[1 3 5;1 5 6;3 9 10;3 5 6;1 4 5;3 5 6; 9 6 7; 1 5 8; 3 6 0];
groups=splitapply( @(X) {X} , A , findgroups(A(:,1)) );
[a,b,A]=deal(groups{:})
a = 4×3
1 3 5 1 5 6 1 4 5 1 5 8
b = 4×3
3 9 10 3 5 6 3 5 6 3 6 0
A = 1×3
9 6 7
  4 Comments
Matt J
Matt J on 29 Jan 2021
You're welcome, but please Accept-click the answer if it resolves your question.

Sign in to comment.

More Answers (0)

Community Treasure Hunt

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

Start Hunting!