Scatter plot with contour according to a paramter using matplotlib

Asked Apr 01 '17 at 13:21

Active Apr 01 '17 at 13:21

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I have a data file having data as shown below:

#x       f(x)    g(x)
0.12    -0.43    0.53
0.64     1.34    0.83
and so on...

Now, I want to make scatter plot f(x) vs g(x) and put contour lines on it according to the x value of the points in the interval of 0.24. I tried to do the plots using contour function but that requires to create a meshgrid and a 2D array and all. But here, x, f(x) and g(x) are all random numbers so I can't create a meshgrid. I need some ideas for how to do this plotting. In addition to that, I have very large datafile (approx. 1.5 GB) and it is taking more than an hour to make a single scatter plot using

plt.plot(x,y,'.')

Any idea for faster plotting is also appreciated.

asked Apr 01 '17 at 13:21

DeusExMachina

2

Possible duplicate of [Make contour of scatter](http://stackoverflow.com/questions/18764814/make-contour-of-scatter) – Stop harming Monica Apr 01 '17 at 13:36
For large data, it is often faster to plot the *density* of points using e.g. `hexbin` or `hist2d`. – Klimaat Apr 01 '17 at 13:45
Yep, it doesn't make sense to plot 10 to 60 times more points that your screen has pixels. – ImportanceOfBeingErnest Apr 01 '17 at 13:48

Scatter plot with contour according to a paramter using matplotlib

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