Organising data from a matrix

Question

Sophie Chumas 2019-7-22

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/472832-organising-data-from-a-matrix

评论： Sophie Chumas 2019-7-22

采纳的回答： Guillaume

Just wondering if you know how I can get the following matrix:

1.0000 0.8147

2.0000 0.3333

3.0000 0.3322

4.0000 0.1000

1.0000 0.9058

2.0000 0.2222

3.0000 0.3322

4.0000 0.2000

1.0000 0.1270

2.0000 0.1223

3.0000 0.2333

4.0000 0.1000

1.0000 0.9134

2.0000 0.1270

3.0000 1.0000

4.0000 0.1000

1.0000 0.6324

2.0000 0.8899

3.0000 0.0001

4.0000 0.1000

1.0000 0.9870

2.0000 0.5670

3.0000 0.3450

4.0000 0.2000

1.0000 0.8999

2.0000 0.9990

3.0000 0.1235

4.0000 0.4000

1.0000 0.9990

2.0000 0.9990

3.0000 0.9990

4.0000 0.0500

1.0000 0.8147

2.0000 0.3333

3.0000 0.3322

4.0000 0.1000

into a new matrix that takes the left hand column as the indices for the data from the right hand column? ie. I'm trying to get the user to specify the variable they wish to use, so when the user input is say 4, it returns a matrix with all the values in the right hand column that have a 4 next to it in the left hand one.

I had tried using regexp but this only seems to work with characters and not numbers...

Thanks! :)

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Answer 1

Guillaume 2019-7-22

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/472832-organising-data-from-a-matrix#answer_384214

在 MATLAB Online 中打开

selectedvalue = 4;
filteredmatrix = yourmatrix(yourmatrix(:, 1) == selectedvalue, :)

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Sophie Chumas 2019-7-22

在 MATLAB Online 中打开

Done it!

u_s_v = input('Select the variable you wish to use by typing the number of its position in the list of variables.');
    chosen_variable = data_matrix((data_matrix(:, 1) == u_s_v), 2);
    disp(chosen_variable);

Thank you!!!!! :D

Sophie Chumas 2019-7-22