How to plot with 'm' rows and 3 columns?

Question

Ara 2013-3-3

0
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https://ww2.mathworks.cn/matlabcentral/answers/65648-how-to-plot-with-m-rows-and-3-columns

Hi Everyone,

Just a simple question; The data is look like below and I want to plot x(for only x>0.2) as a function of Y and time. Could you please help me?

 x     y     time
   15     1
2   20     3
3   25     4
1   33     5
6   90     6

Thanks,

Ara

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Answer 1

Wayne King 2013-3-3

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https://ww2.mathworks.cn/matlabcentral/answers/65648-how-to-plot-with-m-rows-and-3-columns#answer_77179

编辑：Wayne King 2013-3-3

在 MATLAB Online 中打开

You only have two values here above 0.2 so it's not going to be an interesting plot, but let the matrix be A

   A = [0     15     1
    0.2   20     3
    0.3   25     4
    0.1   33     5
    0.6   90     6 ];
  idx = find(A(:,1)>0.2);
  plot3(A(idx,3),A(idx,2),A(idx,1))

or

scatter3(A(idx,3),A(idx,2),A(idx,1))

Or you can simply set the x-values below to 0.2 to NaN for plotting

A(A(:,1) <=0.2) = NaN;
scatter3(A(:,3),A(:,1),A(:,3))

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Ara 2013-3-3

Thanks for your help. Yes, this one is a sample of my data so it may not interesting to plot these columns as you said. Actually, I am dealing with excel data with 32 columns and 5337 rows. According to my data, when I plot as a 3D are not as clear as 2D. So I am wondering if I can find another way to plot it. And How can I read row corresponding to the row? Another question; 3, 2 and 1 represent as columns? plot3(A(idx,3),A(idx,2),A(idx,1))

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