Change y range to start from 0 with matplotlib

Question

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.

Answer 1

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Edit: the ymin argument has been replaced by bottom: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) 

Answer 2

Try this

import matplotlib.pyplot as plt xdata = [1, 4, 8] ydata = [10, 20, 30] plt.plot(xdata, ydata) plt.ylim(ymin=0)  # this line plt.show() 

doc string as following:

>>> help(plt.ylim) Help on function ylim in module matplotlib.pyplot:  ylim(*args, **kwargs)     Get or set the *y*-limits of the current axes.      ::        ymin, ymax = ylim()   # return the current ylim       ylim( (ymin, ymax) )  # set the ylim to ymin, ymax       ylim( ymin, ymax )    # set the ylim to ymin, ymax      If you do not specify args, you can pass the *ymin* and *ymax* as     kwargs, e.g.::        ylim(ymax=3) # adjust the max leaving min unchanged       ylim(ymin=1) # adjust the min leaving max unchanged      Setting limits turns autoscaling off for the y-axis.      The new axis limits are returned as a length 2 tuple.