CODEWITHSUNDEEP
pythonmatplotlib
Hisham Kuntawala
Hisham Kuntawala

Reputation: 141

How do I choose a size between each point on Y axis in Matplotlib?

I am just trying to make a normal graph using a list for the x axis and a list for the y axis. But the thing is, I want to be able to choose the size of the y axis. Like the length between the points. I want to be able to choose that myself. For example, my y axis narrates - 0,2.5,5,7.5...etc. I want to change it to 0,2,4,6,8... etc. So is there a way to do that? I have tried searching for solutions. I came across xlim, ylim and scale factor. I tried it but it didn't give me the result that I wanted. I also tried figsize but that didn't do it either. Perhaps the solution is one of them and I didn't understand it better. Not sure. So would really appreciate some light on this.

Here is my code at the moment

from matplotlib import pyplot as plt

list1 = ['a','b','c','d']
list2 = [3,7,10,20]

plt.plot(list1,list2)

plt.show()

Just a basic code of making a graph.

Upvotes: 1

Views: 428

Answers (3)

Alessandro Benedetto
Alessandro Benedetto

Reputation: 128

this can be done by using set_xticks()

import matplotlib.pyplot as plt
import numpy as np

x1 = np.arange(0, 10, 2.5) #generate a list of numbers spaced by 2.5
x2 = np.arange(0, 10, 2) #generates a list of numbers spaced by 2

x0 = np.arange(0, 10, 0.5) #creates something to plot
y0 = x0**2

fig1, ax1 = plt.subplots()
ax1.plot(x0, y0, '-o')
ax1.set_xticks(x1)
plt.show()

fig2, ax2 = plt.subplots()
ax2.plot(x0, y0, '-s')
ax2.set_xticks(x2)
plt.show()
``̀

Upvotes: 0

Mad Physicist
Mad Physicist

Reputation: 114230

Matplotlib selects tick locations using a Locator object. You can implement your own locator by extending the class matplotlib.ticker.Locator, or by configuring one of the provided ones. For example, your y-axis could be configured with a MultipleLocator:

from matplotlib import pyplot as plt
from matplotlib.ticker import MultipleLocator

fig, ax = plt.subplots()
ax.plot(....)
ax.yaxis.set_major_locator(MultipleLocator(2))

Here is a gallery of the main built-in locators to help you select one you like: https://matplotlib.org/gallery/ticks_and_spines/tick-locators.html

Upvotes: 1

Ankit Beniwal
Ankit Beniwal

Reputation: 529

You can use matplotlib.pyplot.ylim with bottom and top parameters like this: 

plt.ylim(2,20)

Although it starts from 2 but it could be a workaround.

<iframe height="400px" width="100%" src="https://repl.it/@pagalprogrammer/y-lim-matplotlib?lite=true" scrolling="no" frameborder="no" allowtransparency="true" allowfullscreen="true" sandbox="allow-forms allow-pointer-lock allow-popups allow-same-origin allow-scripts allow-modals"></iframe>

Upvotes: 0

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