how to delete a row from a matrix

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nadia nadi
nadia nadi 2015-10-25
编辑： Stephen23 2015-10-25
Dear,
I need to delete rows with all zeros from B and corresponding ones from b, where Bx>=b, so I wrote this code but I got error because of the index, can anyone check it for me please and if there is any faster way will be very helpful. Thanks in advance.
Nadia
B=[
1 0 0 0 0 0 0
0 0 0 1 0 0 0
0 0 0 0 0 0 0
0 1 0 1 0 0 0
0 0 0 0 1 1 0
0 1 0 0 0 0 1
0 0 0 0 0 0 0
0 0 0 0 0 0 1
0 0 1 0 0 0 0];
b=ones(size(B,1),1);
for i=1:size(B,1)
while B(i,:)==0
B(i,:)=[]
b(i,:)=[]
end
end
  1 个评论
Jan
Jan 2015-10-25
The error is caused by running the for i loop until the original size of B, but B has been shortend already inside the loop.

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采纳的回答

Stephen23
Stephen23 2015-10-25
编辑：Stephen23 2015-10-25
When you use vectorized code then this task is simple, and there is no need for complicated loops:
>>B(any(B,2),:)
ans =
1 0 0 0 0 0 0
0 0 0 1 0 0 0
0 1 0 1 0 0 0
0 0 0 0 1 1 0
0 1 0 0 0 0 1
0 0 0 0 0 0 1
0 0 1 0 0 0 0

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