Remove zeros from a vector from a specific position

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Jorge Luis Paredes Estacio
评论： the cyclist 2023-8-18
Hello, I have the following vector as example:
X=[0, 0; 0.02, 2.3;0.04, 0.4; 0, 0; 0.06, 2.5; 0.08, 3.6; 0, 0; 0.10, 2.5]
I want to remove the zeros and I only want to keep the zeros at the beginning and obtain the following matrix:
X=[0, 0; 0.02, 2.3;0.04, 0.4; 0.06, 2.5; 0.08, 3.6; 0.10, 2.5]
I know this option
X( all(~X,2), : ) = [];
which eliminates all the zeros and then I can add the zeros again at the beggining using
X=vertcat([0 0],X);
but there must be a direct way to do it. I would appreciate the help.
  2 个评论
the cyclist
the cyclist 2023-8-18
Will there always be at least one row of zeros at the beginning?
If so, will there always be exactly one row of zeros at the beginning?

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采纳的回答

Bruno Luong
Bruno Luong 2023-8-18
remove = all(~X,2);
remove(1) = false;
X(remove,:) = [];
  6 个评论
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the cyclist
the cyclist 2023-8-18
Ran in:
FYI, this solution will not work if there are multiple rows of leading zeros to keep. (That's why I asked if there was always exactly one row of leading zeros.) For example,
X = [0, 0;
0, 0;
2, 3;
5, 7;
0, 0];
X([false;all(~X(2:end,:),2)],:)=[]
X = 3×2
0 0 2 3 5 7

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