How can delete matrix randomly?
Show older comments
y =[1 2 0.075 0.100 0.000 1.000
2 3 0.080 0.110 0.000 1.000
2 4 0.090 0.180 0.000 1.000
3 9 0.040 0.040 0.000 1.000
4 5 0.040 0.040 0.000 1.000
1 6 0.110 0.110 0.000 1.000
5 14 0.090 0.120 0.000 1.000
6 7 0.080 0.110 0.000 1.000
6 8 0.110 0.110 0.000 1.000
7 9 0.110 0.110 0.000 1.000
7 10 0.080 0.110 0.000 1.000
8 12 0.040 0.040 0.000 1.000
1 11 0.110 0.110 0.000 1.000
11 12 0.090 0.120 0.000 1.000
11 13 0.080 0.110 0.000 1.000
13 14 0.040 0.040 0.000 1.000];
I have matrix y and I want to delete 3 rows randomly. To be like this.
How can I do?
y =[1 2 0.075 0.100 0.000 1.000
2 3 0.080 0.110 0.000 1.000
2 4 0.090 0.180 0.000 1.000
4 5 0.040 0.040 0.000 1.000
1 6 0.110 0.110 0.000 1.000
6 7 0.080 0.110 0.000 1.000
6 8 0.110 0.110 0.000 1.000
7 9 0.110 0.110 0.000 1.000
7 10 0.080 0.110 0.000 1.000
1 11 0.110 0.110 0.000 1.000
11 12 0.090 0.120 0.000 1.000
11 13 0.080 0.110 0.000 1.000
13 14 0.040 0.040 0.000 1.000];
Accepted Answer
KSSV
on 1 Apr 2019
Let y be your matrix:
[nx,ny] = size(y) ;
idx = randsample(1:nx,3) ;
y(idx,:) = []
Note that, yopu are deleting rows..not columns.
1 Comment
pongsapak ruangrob
on 2 Apr 2019
More Answers (1)
It looks like you've deleted rows not columns.
y(randperm(size(y, 1), 3), :) = []; %delete 3 rows at random
y(:, randperm(size(y, 2), 3)) = []; %delete 3 columns at random
3 Comments
KSSV
on 1 Apr 2019
y(randperm(size(y, 1), 3), :) = []; %delete 3 rows at random
y(:, randperm(size(y, 2), 3)) = []; %delete 3 columns at random
Guillaume
on 1 Apr 2019
Yes, I spotted the mistake straight away.
pongsapak ruangrob
on 2 Apr 2019
Categories
Find more on Creating and Concatenating Matrices in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
