[Matplotlib-users] Add disconnected lines to a plot

[Jerzy Karczmarczuk]

Le 03/05/2020 à 01:08, EK Esawi via Matplotlib-users a écrit :
> I am new to Matplotlib. I created a plot and I want to add a set of straight lines from a set of (x,y) coordinates (2D list). I want to have lines drown from 1st to 2nd then from 3rd to 4th and then from 5th to 6th, etc. I don’t want lines between 2nd and 3rd, 4th and 5th, etc. I think it can be done using Path and Patch, but could not get it done. I even tried to rearrange my data in a way to draw one line piece with zigzag shape but that too did not work well.

It suffices to remember that a NAN breaks a plot line. Insert NANs 
between the segments

If you try this:

*import numpy as np
import matplotlib.pyplot as plt

x=np.array(range(20))
x=x.reshape((10,2))  # two columns
h=np.array([10*[np.nan]]).T
xx=np.hstack((x,h)).reshape((30,)) # NANs form the third column; Flatten 
the result

plt.plot(xx,xx,'r',lw=2)*

you should get:

Jerzy Karczmarczuk

/Caen, France/



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