How to delete specific rows in a matrix

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Maryam Hamrahi
Maryam Hamrahi 2017-4-18
评论： Maryam Hamrahi 2017-4-18
Hi everybody,
I have a very huge matrix, and I need to deleted rows when some of column numbers are equal to zero.
Here is a simple example.
A=[ a1 a2 a3 a4 a5 a6 a7 a8
b1 b2 b3 b4 b5 0 0 0
c1 c2 c3 c4 c5 0 0 0
d1 d2 d3 d4 d5 d6 d7 d8
.
.
.
.
.
.
.
z1 z2 z3 z4 z5 0 0 0]
how could I delete rows when the last three columns are zero?
Thank you very much.
  1 个评论
Maryam Hamrahi
Maryam Hamrahi 2017-4-18
I used this code to solve a simple example:
A= [1 2 3 4 5 0 0
1 2 4 7 8 0 0
2 3 5 4 3 5 7];
TF = A(:,6:7)==0
% remove
A(TF,:) = []
why I get this error:
Error in Untitled (line 6)
A(TF,:) = []

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采纳的回答

Stephen23
Stephen23 2017-4-18
编辑：Stephen23 2017-4-18
You need to use all or any:
>> A = [1,2,3,4,5,0,0; 1,2,4,7,8,0,0; 2,3,5,4,3,5,7]
A =
1 2 3 4 5 0 0
1 2 4 7 8 0 0
2 3 5 4 3 5 7
>> B = A(any(A(:,6:7),2),:)
B =
2 3 5 4 3 5 7

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