how can i plot this data?

Question

ciaran balfe 2019-3-11

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关闭： MATLAB Answer Bot 2021-8-20

i have this data from a text file that i want to plot like the supplied image, can anyone help me please?

here is the code i used to graph the picture shown

fidi = fopen('carpos2.txt','rt');

Dc = textscan(fidi, '%f%f%f%*f', 'CollectOutput',1);

fclose(fidi);

D = cell2mat(Dc);

ExptVct = unique(D(:,1));

RowLim = floor(size(D,1)/numel(ExptVct))*numel(ExptVct);

D = D(1:RowLim,:);

Dr = reshape(fidi = fopen('carpos2.txt','rt');

Dc = textscan(fidi, '%f%f%f%*f', 'CollectOutput',1);

fclose(fidi);

D = cell2mat(Dc);

ExptVct = unique(D(:,1));

RowLim = floor(size(D,1)/numel(ExptVct))*numel(ExptVct);

D = D(1:RowLim,:);

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 (s)')

ylabel('velocity (m/s)')

%%title('Car ')

%%legend(compose('%2d',ExptVct), 'Location','NW')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 (s)')

ylabel('velocity (m/s)')

%%title('Car ')

%%legend(compose('%2d',ExptVct), 'Location','NW')

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Answer 1

Star Strider 2019-3-11

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My code works just as well now as it did earlier, alghout you need to change this assignment back to the way I had it originally, from:

Dc = textscan(fidi, '%f%f%f%*f', 'CollectOutput',1);

that will not work for more reasons than I have time to enumerate just now, to:

Dr = reshape(D, numel(ExptVct), [], 3);

that I originally wrote (plotting multiple series on one graph from a text file).

With these corrections, my code produces:

how can i plot this data (1) - 2019 03 11.png

and:

how can i plot this data (2) - 2019 03 11.png

I numbered them sequentially to accommodate the earlier image plots I have stored for this project. These are ‘carpos2’ and ‘carpos’ respectively in your current post.

Note that the curves cross, so if the cars are in the same lane, it is best to notify the local constabulary and appropriate insurance firms, and hope that no one gets hurt!

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Star Strider 2019-3-11

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My pleasure.

Make that one change, and my code should work.

The code I used this time:

filename{1} = 'carpos3';
filename{2} = 'carpos4';
plottitle{1} = 'Carpos 3';
plottitle{2} = 'Carpos 4';
k2 = 1;
fidi = fopen(sprintf('ciaran balfe %s.txt',filename{k2}), 'rt');
Dc = textscan(fidi, '%f%f%f%*f', 'CollectOutput',1);
fclose(fidi);
D = cell2mat(Dc);
ExptVct = unique(D(:,1));                                       
RowLim = floor(size(D,1)/numel(ExptVct))*numel(ExptVct);        
D = D(1:RowLim,:);                                             
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 (s)')
ylabel('velocity (m/s)')
%%title('Car ')
%%legend(compose('%2d',ExptVct), 'Location','NW')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 (s)')
ylabel('velocity (m/s)')
title(plottitle{k2})

I checked it again just now to be sure it works. It does.

I saved them as ‘ciaran balfe carpos3.txt’ and ‘ciaran balfe carpos4.txt’ respectively (so as not to overwrite the earlier files, and so I can find them easily). Make the necessary changes with respect to your filenames and the fopen sprintf calls to plot them.

Star Strider 2019-3-12

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The plot of your latest ‘carpos.txt’ (that I named ‘carpos7.txt’ looks really strange (even ignoring the fourth column). The third column of the last several lines are all 0, so that’s likely part of the problem, since the cars all appear to come to a screeching stop:

549.800000 17878.004890 0
549.800000 17291.187202 0
549.800000 16061.612290 0
549.800000 11253.881351 0
549.800000 10473.048720 0
549.800000 10402.384327 0
549.800000 6470.378925 0
549.800000 4969.844054 0
549.800000 4881.642854 0
549.800000 2439.252297 0
549.800000 2387.394337 0
549.800000 2320.365332 0
549.800000 898.446775 0
549.800000 855.370560 0
549.800000 740.120959 0
549.800000 0.000000 0
549.800000 0.000000 0
549.800000 0.000000 0
549.800000 0.000000 0
549.800000 0.000000 0
549.800000 0.000000 0
549.800000 0.000000 0
549.800000 0.000000 0
549.800000 0.000000 0

I have no idea how you want to handle that.

Your latest ‘carpos2.txt’ (that I named ‘carpos8.txt’) looks normal, again ignoring the fourth column.

I have no idea how to interpret your data. You simply asked me to figure out how to plot it so it looks the way you want it to, and I did.

ciaran balfe 2019-3-15

hi im sory to bother you again but i think i know why my other files wont work, it messes with your call to Dr = reshape(D, numel(ExptVct), [], 3); as in the new files more additions to column 1 are being added in as time goes on or as the text file progresses and this messes with the arrays produced in your 'Dr'. is there any way of completing the same plot without having this 'Dr' part of the code? thanks!

Star Strider 2019-3-15

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The ‘Dr’ matrix is necessary for the code in order to plot your data the way you originally said you want it plotted. It is part of four different function calls that create the the matrix data from your original vector:

ExptVct = unique(D(:,1));                                       
RowLim = floor(size(D,1)/numel(ExptVct))*numel(ExptVct);        
D = D(1:RowLim,:);                                             
Dr = reshape(D, numel(ExptVct), [], 3);

These restrict the number of rows of your matrix that are used to create ‘Dr’ in order that it has compatible dimensions.

It worked with your original data, and ist assumptions are based on them. So long as your subsequent data are compatible with those original data, my code should work with them as well. If they are not, I cannot guarantee that it will.

how can i plot this data?

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how can i plot this data?

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