plotting multiple series on one graph from a text file

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ciaran balfe 2019-2-11

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https://ww2.mathworks.cn/matlabcentral/answers/444381-plotting-multiple-series-on-one-graph-from-a-text-file

评论： ciaran balfe 2019-3-11

采纳的回答： Star Strider

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i am trying to make a single graph from a text file which is looped with 15 different variables over time.

does anyone know how i can do this? below is an attachment of the text file im attempting to graph.

column one repeats itself 1-15 and i wish for each integer from 1-15 to have its own series on the graph

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Answer 1

Star Strider 2019-2-11

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They all appear to plot together, and there is no easy way to offset them to plot them in a single plot. The best option then appears to be plotting them each in a subplot:

fidi = fopen('carpos.txt','rt');
Dc = textscan(fidi, '%f%f%f', 'CollectOutput',1);
D = cell2mat(Dc);
endData = find(D(:,1) == 14, 1, 'last');
D = D(1:endData,:);
Dr = reshape(D, 15, 3, []);
figure
for k1 = 1:size(Dr,1)
    subplot(5,3,k1)
    plot3(squeeze(Dr(k1,1,:)), squeeze(Dr(k1,2,:)), squeeze(Dr(k1,3,:)))
    grid on
    axis equal
    title(sprintf('%d',k1-1))
end

Experiment to get the result you want.

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Star Strider 2019-2-13

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Some of your files do not have the complete set of experiments. My code (different versions) ran without error with the files you posted.

This revision should work for all your files, although it will not use the ending data sets in your files that do not have the complete set of experiments, because those are incompatible with the reshape function.

The revised code is now:

fidi = fopen('carpos.txt','rt');
Dc = textscan(fidi, '%f%f%f', 'CollectOutput',1);
fclose(fidi);
D = cell2mat(Dc);
ExptVct = unique(D(:,1));                                       % ‘Experiments’ Vector (Assumes All Data Sets Have The Same Number Of Experiments)
RowLim = floor(size(D,1)/numel(ExptVct))*numel(ExptVct);        % Row Limit Of Data Sets With Complete Experiments
D = D(1:RowLim,:);                                              % Trim ‘D’ To Data Sets With Complete Experiments
Dr = reshape(D, numel(ExptVct), [], 3);
figure
hold all
for k1 = 1:size(Dr,1)
    plot(squeeze(Dr(k1,:,2)), squeeze(Dr(k1,:,3)))
end
hold off
grid
xlabel('Simulation Time (10^{-1} s)')
title('Car Position')
legend(compose('%2d',ExptVct), 'Location','NW')

I tested this with both ‘carpos(1).txt’ (the original file) and ‘carpos(2).txt’ the second file you provided. It now also uses ‘ExptVct’ for the legend in the plot.

You could turn this into a function if you want, with the only argument being the file name. That would be:

function carposplot(filename)
fidi = fopen(filename,'rt');
Dc = textscan(fidi, '%f%f%f', 'CollectOutput',1);
fclose(fidi);
D = cell2mat(Dc);
ExptVct = unique(D(:,1));                                       % ‘Experiments’ Vector (Assumes All Data Sets Have The Same Number Of Experiments)
RowLim = floor(size(D,1)/numel(ExptVct))*numel(ExptVct);        % Row Limit Of Data Sets With Complete Experiments
D = D(1:RowLim,:);                                              % Trim ‘D’ To Data Sets With Complete Experiments
Dr = reshape(D, numel(ExptVct), [], 3);
figure
hold all
for k1 = 1:size(Dr,1)
    plot(squeeze(Dr(k1,:,2)), squeeze(Dr(k1,:,3)))
end
hold off
grid
xlabel('Simulation Time (10^{-1} s)')
title('Car Position')
legend(compose('%2d',ExptVct), 'Location','NW')
end

Save it as ‘carposplot.m’ to a directory in your MATLAB search path. Then call it as:

carposplot('carpos.txt')

It has no outputs, although you could return some of its calculations if you want, by defining the function to have those outputs.

I tested the function with both of your files, and it ran without error with each.

Star Strider 2019-2-23

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You need to tell textscan to ignore the

column (since I believe that is what you want to do). Do that by adding a ‘%*f’ to the end of the format string:

fidi = fopen('pos2.txt');
Dc = textscan(fidi, '%f%f%f%*f', 'CollectOutput',1);
fclose(fidi);
D = cell2mat(Dc);
ExptVct = unique(D(:,1));                                       % ‘Experiments’ Vector (Assumes All Data Sets Have The Same Number Of Experiments)
RowLim = floor(size(D,1)/numel(ExptVct))*numel(ExptVct);        % Row Limit Of Data Sets With Complete Experiments
D = D(1:RowLim,:);                                              % Trim ‘D’ To Data Sets With Complete Experiments
Dr = reshape(D, numel(ExptVct), [], 3);
figure
hold all
for k1 = 1:size(Dr,1)
    plot(squeeze(Dr(k1,:,2)), squeeze(Dr(k1,:,3)))
end
hold off
grid
xlabel('Simulation Time (10^{-1} s)')
title('Car Position')
legend(compose('%2d',ExptVct), 'Location','NW')

producing:

plotting multiple series on one graph from a text file - (2019 02 11-13) - 2019 02 23.png

This looks like the previous plots, so I’m guessing that I ignored the correct (

) column of repeated ‘2’ values.

Experiment to get the result you want.

ciaran balfe 2019-3-11

hi thank you again for your help, i hope you dont mind me asking another question. i have 2 output files and the are crossing over in data. i basically am looking for the exact same graph as you have kindly shown me beofre but it isnt graphing properly. ive attached a text file im trying to graph. thank you again. (fyi you were completely correct about ignoring the 4th column, its to be ignored in this one too).

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plotting multiple series on one graph from a text file

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