Plot several lines on the same plot for the same unique category

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Mohammad Aljarrah 2020-3-4

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https://ww2.mathworks.cn/matlabcentral/answers/508946-plot-several-lines-on-the-same-plot-for-the-same-unique-category

评论： darova 2020-3-4

采纳的回答： KSSV

Hello,

i have a table which consists of the following data

Category Frequency Modulus

1 5 20

1 2 23

1 8 50

1 1 13

2 5 30

2 2 33

2 8 60

2 1 24

i want to plot Frequency vs. Modulus for each unique category (here i only showed 1 and 2 but i have more than that). also as you can see, my frequency data are not in sequence (they are shuffled 5,2,8,1,...). i want to produce a graph like the shown below (here, each line represents a different category). my frequqncy range is between 1 to 20.

i tried to produce a line for only one category, however what i got is shown in the other graph, i was not able to plot it in a sequential order.

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darova 2020-3-4

Number of points in each category is the same?

Mohammad Aljarrah 2020-3-4

yes, for each category the number of frequnecies are the same (from 1-20Hz)

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采纳的回答

KSSV 2020-3-4

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https://ww2.mathworks.cn/matlabcentral/answers/508946-plot-several-lines-on-the-same-plot-for-the-same-unique-category#answer_418457

编辑：KSSV 2020-3-4

在 MATLAB Online 中打开

Let T be your data of size m*3.

C = T(:,1) ;    % category 
F = T(:,2) ;    % Frequency 
M = T(:,3) ;    % Modulus 
figure
hold on 
for i = 1:length(unique(C))
    Fi = F(C==i) ;
    Mi = M(C==i) ; 
    [Fi,id] = sort(Fi) ;
    Mi = Mi(id)
    plot(Fi,Mi,'.-')
end

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Mohammad Aljarrah 2020-3-4

you are awesome, thank you very much

darova 2020-3-4

在 MATLAB Online 中打开

try also

C = T(:,1) ;    % category 
F = T(:,2) ;    % Frequency 
M = T(:,3) ;    % Modulus 
N = 4;          % number of points
FF = reshape(F,N,[]);
MM = reshape(M,N,[]);
plot(FF,MM)