# How to delete specific rows in a matrix

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Maryam Hamrahi il 18 Apr 2017
Commentato: Maryam Hamrahi il 18 Apr 2017
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.
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Maryam Hamrahi il 18 Apr 2017
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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### Risposta accettata

Stephen23 il 18 Apr 2017
Modificato: Stephen23 il 18 Apr 2017
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
##### 1 CommentoMostra -1 commenti meno recentiNascondi -1 commenti meno recenti
Maryam Hamrahi il 18 Apr 2017
Thank you Stephen Cobeldick.
It was very nice of you.

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