How to delete or exclude an entire matrix if it contains all zeros

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Caitlin 2024-1-26

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评论： Image Analyst 2024-2-3

I'm reading a large data set where sometimes there is a matrix of all zeros in all rows and columns. How do I either delete the entire matrix of zeros after it has been read, or exclude MATLAB from saving it in the first place?

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采纳的回答

William Rose 2024-1-27

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@Caitlin, you'll have to be more specific about how you are reading in the data in order to get a useful answer.

X=zeros(10,10);
whos            % show variables in the workspace
  Name         Size            Bytes  Class     Attributes

  X           10x10              800  double              
  cmdout       1x33               66  char                

You can delete variable X with

clear X
whos
  Name        Size            Bytes  Class    Attributes

  cmdout      1x33               66  char               

The output from whos shows that X is gone now.

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William Rose 2024-2-3

@Caitlin, you're welcome.

Image Analyst 2024-2-3

If this Answer solves your original question, then could you please click the "Accept this answer" link to award the answerer with "reputation points" for their efforts in helping you? They'd appreciate it. Thanks in advance. 🙂 Note: you can only accept one answer (so pick the best one) but you can click the "Vote" icon for as many Answers as you want. Voting for an answer will also award reputation points.

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