How to specifically select columns in a data matrix?

Question

jj ，2011-11-12

10
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Direct link to this question

https://ww2.mathworks.cn/matlabcentral/answers/21030-how-to-specifically-select-columns-in-a-data-matrix

评论： Fercho_Sala ，2021-4-15

Hello guys,

I know this is a really simple question, which I can't seem to find any answers around on the internet or the help stuffs I've on Matlab.

I've uploaded a dataset with 100 data series. However, I'm trying to select only specific column, say column 77 to 83, and column 86. How do I do that in Matlab? Typically, it would be:

xdatatemp =xdata(:,77:86) - to select columns 77 to 86. But, how do I specifically select col 77 to 83, and col 86?

Many thanks.

J

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Answer 1

Sven 2011-11-12

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https://ww2.mathworks.cn/matlabcentral/answers/21030-how-to-specifically-select-columns-in-a-data-matrix#answer_27739

Try:

xdatatemp = xdata(:,[77:83 86])

And you can even use "end" keywords such as:

xdatatemp = xdata(:,[77:83 86 end end:-1:end-5])

That is, of course, if you wanted columns 77 to 83, then 86, then the last column, then the last 5 columns counted backwards ;)

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Fercho_Sala 2021-4-15

@Rik ok, understood... I'm sorry ;)

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Answer 2

Coral del Mar Valle Rodriguez 2020-5-14

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/21030-how-to-specifically-select-columns-in-a-data-matrix#answer_432493

编辑：Coral del Mar Valle Rodriguez 2020-5-14

I have a matrix of various rows, and three columns. some of the data sets have the same number. I would like to put them together in order to graph it. how do I separate the matrix by value? for example, all the values right to the #1, etc?

1961                1               -11.4
         1961            2        -12.3
         1961            3         -8.2
         1961            4         -8.6
         1961            5         -2.4
         1961            6          7.4
         1961            7         14.8
         1961            8         11.1
         1961            9          5.9
         1961           10          3.7
         1961           11         -6.3
         1961           12        -13.3
         1962            1        -12.7
         1962            2         -8.1
         1962            3          -13
         1962            4         -1.1
         1962            5          2.8
         1962            6          5.9
         1962            7         12.2
         1962            8          8.9
         1962            9          7.2
         1962           10         -0.1
         1962           11           -1
         1962           12          -11