[FIXED] Change y range to start from 0 with matplotlib

Issue

I am using matplotlib to plot data. Here's a code that does something similar:

import matplotlib.pyplot as plt
f, ax = plt.subplots(1)
xdata = [1, 4, 8]
ydata = [10, 20, 30]
ax.plot(xdata, ydata)
plt.show(f)

This shows a line in a graph with the y axis that goes from 10 to 30. While I am satisfied with the x range, I would like to change the y range to start from 0 and adjust on the ymax to show everything.

My current solution is to do:

ax.set_ylim(0, max(ydata))

However I am wondering if there is a way to just say: autoscale but starts from 0.

Solution

The range must be set after the plot.

import matplotlib.pyplot as plt
f, ax = plt.subplots(1)
xdata = [1, 4, 8]
ydata = [10, 20, 30]
ax.plot(xdata, ydata)
ax.set_ylim(ymin=0)
plt.show(f)

If ymin is changed before plotting, this will result in a range of [0, 1].

Edit: the ymin argument has been replaced by bottom:

ax.set_ylim(bottom=0)

Documentation: https://matplotlib.org/stable/api/_as_gen/matplotlib.axes.Axes.set_ylim.html

You can do the same on the x axis with left and right:

ax.set_xlim(left=0)

Documentation: https://matplotlib.org/stable/api/_as_gen/matplotlib.axes.Axes.set_xlim.html

Answered By - Maxime Chéramy