FIll between two vertical lines in matplotlib
I went through the examples in the
matplotlib documentation, but it wasn't clear to me how I can make a plot that fills the area between two specific vertical lines.
For example, say I want to create a plot between
x=4 (for the full
y range of the plot). Should I use
Can I use the
where condition for this?
It sounds like you want
axvspan, rather than one of the fill between functions. The differences is that
axhspan) will fill up the entire y (or x) extent of the plot regardless of how you zoom.
For example, let's use
axvspan to highlight the x-region between 8 and 14:
import matplotlib.pyplot as plt fig, ax = plt.subplots() ax.plot(range(20)) ax.axvspan(8, 14, alpha=0.5, color='red') plt.show()
You could use
fill_betweenx to do this, but the extents (both x and y) of the rectangle would be in data coordinates. With
axvspan, the y-extents of the rectangle default to 0 and 1 and are in axes coordinates (in other words, percentages of the height of the plot).
To illustrate this, let's make the rectangle extend from 10% to 90% of the height (instead of taking up the full extent). Try zooming or panning, and notice that the y-extents say fixed in display space, while the x-extents move with the zoom/pan:
import matplotlib.pyplot as plt fig, ax = plt.subplots() ax.plot(range(20)) ax.axvspan(8, 14, ymin=0.1, ymax=0.9, alpha=0.5, color='red') plt.show()