Python Forum

I am confused in xlim() and xticks() function of Matplotlib.pyplot.
are both same or different ? Please explain with simple graph example..

They are different. The first (plt.xlim()) returns range for x-axis values of the current axes-instance,
the second returns array of xtick labels (where labels will be placed) within the interval returned by xlim.

Look at the following example:

import matplotlib.pyplot as plt
ax = plt.gca() # returns current axes (creates if needed)
ax.get_xlim()  # now this is equivalent to plt.xlim(), plt.xlim() returns xlims for the current axes

Output:
(0.0, 1.0)

ax.get_xticks()  # returns where ticks be located. plt.xticks() returns xticks for the current axes

Output:
array([0. , 0.2, 0.4, 0.6, 0.8, 1. ])

Lets change xlims, e.g.

ax.set_xlim(5, 9) #  the same as plt.xlim(5, 9) (we are still working with the current axes)

Output:
(5, 9)

plt.xticks()

Output:
(array([5. , 5.5, 6. , 6.5, 7. , 7.5, 8. , 8.5, 9. ]),
 <a list of 9 Text xticklabel objects>)

ax.get_xticks()

Output:
array([5. , 5.5, 6. , 6.5, 7. , 7.5, 8. , 8.5, 9. ])

plt.xlim()

Output:
(5.0, 9.0)

(Jul-11-2019, 02:10 AM)scidam Wrote: [ -> ]They are different. The first (plt.xlim()) returns range for x-axis values of the current axes-instance,
the second returns array of xtick labels (where labels will be placed) within the interval returned by xlim.

Look at the following example:

import matplotlib.pyplot as plt
ax = plt.gca() # returns current axes (creates if needed)
ax.get_xlim()  # now this is equivalent to plt.xlim(), plt.xlim() returns xlims for the current axes

Output:
(0.0, 1.0)

ax.get_xticks()  # returns where ticks be located. plt.xticks() returns xticks for the current axes

Output:
array([0. , 0.2, 0.4, 0.6, 0.8, 1. ])

Lets change xlims, e.g.

ax.set_xlim(5, 9) #  the same as plt.xlim(5, 9) (we are still working with the current axes)

Output:
(5, 9)

plt.xticks()

Output:
(array([5. , 5.5, 6. , 6.5, 7. , 7.5, 8. , 8.5, 9. ]),
 <a list of 9 Text xticklabel objects>)

ax.get_xticks()

Output:
array([5. , 5.5, 6. , 6.5, 7. , 7.5, 8. , 8.5, 9. ])

plt.xlim()

Output:
(5.0, 9.0)

can we use values with Negative X-axis/Y-axis ?

(Jul-11-2019, 03:27 PM)ift38375 Wrote: [ -> ]can we use values with Negative X-axis/Y-axis ?

Yes, you can use negative values in these functions.