How to plot selective data?

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Kelsey 2013-9-19

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https://ww2.mathworks.cn/matlabcentral/answers/87631-how-to-plot-selective-data

I have some data in the following form, outputted from a different computer program:

(That is, 3 separate columns of data...continuing on for 1000 rows) I am wondering how to create a plot with JUST the first and second columns, or first and third columns, of data--seeing as doing this manually would take forever. How do I arrange these data such that they're in matrices that are readable for MATLAB? Thanks much in advance!

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Answer 1

Azzi Abdelmalek 2013-9-19

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编辑：Azzi Abdelmalek 2013-9-19

在 MATLAB Online 中打开

If A is your matrix

plot(A(:,1),A(:,2))

%or

plot(A(:,1),A(:,3))

If your data are in a text file you can read it:

A=dlmread('yourfilename.txt')

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Kelsey 2013-9-19

Great! But how do I put all this data in matrix form? (i.e., brackets and commas/semicolons)

Azzi Abdelmalek 2013-9-19

在 MATLAB Online 中打开

just add square brackets

A=[1 2 3
 4 5 6
 7 8 9]

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Answer 2

Jan 2013-9-19

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https://ww2.mathworks.cn/matlabcentral/answers/87631-how-to-plot-selective-data#answer_97227

What exactly is the problem? Are these data written to a file and you are looking for the fscanf command to read them? Does dlmread as suggested by Azzi work or not?