How to extract data from specific row

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Fouziah Yassin
Fouziah Yassin 2023-1-3
评论： Bjorn Gustavsson 2023-1-5
Hi,
I am still new using MATLAB. For your information, I have the data at the workspace (40000 x 7 double) but how can I extract the data at the row with the value of the first column is 1 or 2? Thank you in advance.

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采纳的回答

Bjorn Gustavsson
Bjorn Gustavsson 2023-1-3
编辑：Bjorn Gustavsson 2023-1-3
You can do things like this in matlab:
data_oi = data(data(:,1)==1|data(:,1)==2,:);
This wouild give you your data of interest in a variable data_oi where the elements in the first column is either a 1 or a 2. If you're this new to matlab, then one good recommendation is to browse through the on-ramp material - which is a introductory information presentation.
HTH
  2 个评论
Fouziah Yassin
Fouziah Yassin 2023-1-4
Many thanks for the answer and it's really helpful. Really appreciate it. I tried it and understood how it worked.

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更多回答（1 个）

Mathieu NOE
Mathieu NOE 2023-1-3
If your data is A , the rows that contains 1 in the first column are defined by ind1
see example below
% dummy data
A = rand(10,10);
A(:,1) = randi(3,10,1);
% extract data when first column contain 1
ind1 = (A(:,1)==1); % logical index
A1 = A(ind1,:) % A extract for first column containing 1's
% extract data when first column contain 2
ind2 = (A(:,1)==2); % logical index
A2 = A(ind2,:) % A extract for first column containing 2's
  1 个评论
Fouziah Yassin
Fouziah Yassin 2023-1-4
Thank you for the code with the explanation. It is really useful for me to learn.

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