How do I select specific data?

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Charlie Finnie
Charlie Finnie 2016-10-21
回答： Sulaymon Eshkabilov 2022-8-10
Hi I am new to Matlab and I'm trying to get my feet on the ground here.
I have 2 columns of data and but I only want to select data in column 2 for a given number of rows which I have defined using
> find(time<5)
where time is the number of the variable in column 1.
This has given me the row numbers for all the data I want, Now I was just wandering how I select the data in column 2 for these row numbers?
Thanks

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回答（4 个）

Mischa Kim
Mischa Kim 2016-10-21
Use
mat(find(time<5),2)
Star Strider
Star Strider 2016-10-21
If your (Nx2) array is called ‘data’:
ExtractedData = data(find(time<5),2);
should work.
Pico Technology
Pico Technology 2016-10-21
Hi Charlie,
You can index a matrix using the row column indices - matrix dimensions are defined as number of rows x number of columns. The following article should help:
Matrix Indexing in MATLAB
If r is the rows i.e.
r = find(time<5)
then you can extract the data from your 2nd column as follows (assuming x is the matrix)
y = x(r, 2);
Hope this helps.
Sulaymon Eshkabilov
A simple solution is:
Select_Data = Data(time<5,2);

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