how can I delete some rows from 2-D array?

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Aniee Shah
Aniee Shah 2017-5-27
评论： Aniee Shah 2017-5-27
I have a 2d array of 2x1500 i want to delete those rows which contain 0 in their first column. If someone knows how to do this plz tell me .

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Stephen23
Stephen23 2017-5-27
编辑：Stephen23 2017-5-27
Where M is your matrix:
newmat = M(M(:,1)~=0,:)

更多回答（1 个）

MathReallyWorks
MathReallyWorks 2017-5-27
Hello Aniee,
I tried this, it works as per your requirement.
copy and paste this in command window:
A=[ 0 2; 2 3; 0 5; 6 0; 7 8; 8 0; 9 1]
A =
0 2
2 3
0 5
6 0
7 8
8 0
9 1
Now, copy and paste this in command window:
%I have taken only 7 rows. You can do this for 1500 rows. It works exactly the same way.
for i=1:7
if A(i,1) == 0
A(i,:) = [];
end
end
Now type A in command window:
A =
2 3
6 0
7 8
8 0
9 1
You can see the difference.
I hope it will be helpful.

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