I'm sorry for not providing code for my question, as I usually always provide code but this time I am not really sure how to achieve my goal, which is why I would like your guy's help. So I am trying to plot the phase Portrait of a van der pol oscillator. The way I wish the plot to look is this way:
I am trying to emphasize the attraction region. My problem is the followong:
1) I am not familiar with quiver and also not sure how to use it
2) I can get the data from Matlab but I do not know how to use it
A code example of how this can be achieved would of course be perfect but tips on how to use tikz in combination with Matlab would also be okay. Till now I exported a data set with the command stated in pgfplots with 4 columns (x,y,u,v) but I am not really sure how to use them. Is there a way to make pgf use the ready data ?
I appreciate all the help
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Edit: I added some data that I've accumulated from MATLAB simulations.
The matlab plot looks like this:
[]
The columns are 1: x 2:y 3:u 4: v