How to plot time-space diagram?

2017 12 25
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更新时间：2017 12 26
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i have an excel file with the following type of data. Columns represent ID,time and x cordinate respectively.
Is there any way that I could plot a graph against x-cordinate and time for different IDs? I have 1000's of Id's and this is just a preview for first two ID's.
theoretically these are locations of vehicles at different times. so therefore i need to plot graphs for each vehicle in the same graph.
Thanks

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Birdman
Birdman 2017-12-25

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Use hold on command. Consider these vectors are stored in a multidimensional array called data.
plot(data(:,1),data(:,2));hold on;grid on;plot(data(:,1);data(:,3))

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Matlab Newbee
Matlab Newbee 2017-12-26
Thank you for the suggestion. i tried hold on and it is useful when you have a straight forward array.
In this case, to clarify my problem, I need to filter the rows with ID '1' and plot a graph for that, and then ID '2', so on...
Is there any way that I could do that?
Thank you
Birdman
Birdman 2017-12-26
Yes there is. For instance, consider the following for your description in the problem.
A(A(:,1)==1,:)
The above line will give you rows with ID=1, then do the same for ID '2'. and then using plot command, you can plot whatever you want.
Matlab Newbee
Matlab Newbee 2017-12-26
Thank you. That is exactly what I wanted

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