How can delete matrix randomly?

2019 4 1
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更新时间：2019 4 2
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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];

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 采纳的回答

KSSV
KSSV 2019-4-1

0 个投票

Let y be your matrix:
[nx,ny] = size(y) ;
idx = randsample(1:nx,3) ;
y(idx,:) = []
Note that, yopu are deleting rows..not columns.

更多回答（1 个）

Guillaume
Guillaume 2019-4-1
编辑：Guillaume 2019-4-1

0 个投票

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

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KSSV
KSSV 2019-4-1
y(randperm(size(y, 1), 3), :) = []; %delete 3 rows at random
y(:, randperm(size(y, 2), 3)) = []; %delete 3 columns at random
Guillaume
Guillaume 2019-4-1
Yes, I spotted the mistake straight away.
Thank you. That my fault. I need to delete rows.

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