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Delete Rows that have a negative number in their first column.

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Hajik zagori
Hajik zagori 2011-8-10
Hi, I have a 5x2 matrix like this:
A=[-1 2;2 -4;-5 9;-3 7;8 6;]
Now I want a code to delete rows that have negative value in their first column. so the output will be this matrix: newA=[2 -4;8 6;]
tnx.

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采纳的回答

Paulo Silva
Paulo Silva 2011-8-10
A=[-1 2;2 -4;-5 9;-3 7;8 6]
%find the rows that we don't want, remove them and show the rest
A(A(:,1)<0,:)=[]
another way
A(A(:,1)>=0,:) %find and show only the rows that we want

更多回答（2 个）

Fangjun Jiang
Fangjun Jiang 2011-8-10
A=[-1 2;2 -4;-5 9;-3 7;8 6;]
Index=A(:,1)<0;
NewA=A(~Index,:)
Or, a one-liner:
A=[-1 2;2 -4;-5 9;-3 7;8 6;]
A(A(:,1)<0,:)=[]
Hajik zagori
Hajik zagori 2011-8-10
Thanks Paulo and Fangjun. :X Both of your answers worked perfectly.

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