How to delete specific rows in a matrix

Question

Maryam Hamrahi 2017-4-18

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https://ww2.mathworks.cn/matlabcentral/answers/335853-how-to-delete-specific-rows-in-a-matrix

评论： Maryam Hamrahi 2017-4-18

采纳的回答： Stephen23

在 MATLAB Online 中打开

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 2017-4-18

在 MATLAB Online 中打开

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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Answer 1

Stephen23 2017-4-18

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https://ww2.mathworks.cn/matlabcentral/answers/335853-how-to-delete-specific-rows-in-a-matrix#answer_263387

编辑：Stephen23 2017-4-18

在 MATLAB Online 中打开

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