How to remove some elements from a matrix?

Question

0 个投票

Hi everyone

Now I have a matrix which has two columns and several rows.

How can I remove the rows which contains value that read 0 and create a new matrix?

Any help would be really appreciated!

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Answer 1

Star Strider 2015-4-23

1 个投票

The find function with two outputs is helpful here:

M = randi([0 10], 20, 2);       % Create Data
[r,~] = find(M == 0);           % Rows With ‘0’
M(r,:) = [];                    % Delete Rows With ‘0’

Answer 2

Stephen23 2015-4-23

编辑：Stephen23 2015-4-23

1 个投票

We can do this simply using all and logical indexing, which is faster than using find and also allows us to allocate directly to a new matrix:

>> M = randi([0,5], 8, 2)
M =
   4
   4
   4
   2
   3
   1
   4
   0
>> N = M(all(M~=0,2),:)
N =
   4
   4
   4
   2
   3
   4

Jarvis Huang 2015-4-23

Thank you, Stephen!