The slides I was using when delivering a meetup about the matplotlib library. More info about that meetup can be found at https://www.meetup.com/life-michael/events/271738271/

1. The matplotlib Library
Haim Michael
October 14th
, 2020
All logos, trade marks and brand names used in this presentation belong
to the respective owners.
lifemichael

2. © 2008 Haim Michael 20150729
What is Matplotlib?
 Matplotlib is a library that allows us to create static,
animated, and interactive visualizations in Python.

3. © 2008 Haim Michael 20150729
Installing Matplotlib
 The simplest way to install matplotlib would be to install it
using the pip utility.
pip install matplotlib

4. © 2008 Haim Michael 20150729
The plot Function
 There are various ways to use the matplotlib library for
drawing diagrams. The simplest would be using the plot
function, that was defined inside the matplotlib.pyplot
module, passing over the x and the y coordinates.

5. © 2008 Haim Michael 20150729
The show Function
 Once completed, calling show will draw the diagram on the
screen.
import matplotlib.pyplot as plt
import numpy as np
plt.plot([1,2,3,4], [4,3,2,1], label='linear')
plt.legend()
plt.show()

6. © 2008 Haim Michael 20150729
The show Function

7. © 2008 Haim Michael 20150729
The Figure Class
 When instantiating matplotlib.figure.Figure class
we get an object that represents a window (or a page) on
which everything will be plotted.

8. © 2008 Haim Michael 20150729
The add_subplot Method
 We can invoke add_sublot on a Figure object in order to
add axes for plotting a diagram.

9. © 2008 Haim Michael 20150729
The add_subplot Method
import matplotlib.pyplot as plt
import numpy as np
fig = plt.figure()
ax = fig.add_subplot()
ax.scatter([1,2,3,4,5],[4,3,7,8,20])
plt.show()

10. © 2008 Haim Michael 20150729
The subplots Function
 We can invoke the sublots function that was defined in the
matplotlib.pyplot module and get a tuple that holds a
reference for a Figure object and a reference for an Axes
object.

11. © 2008 Haim Michael 20150729
The subplots Function
import matplotlib.pyplot as plt
import numpy as np
x = np.linspace(0, 2, 20)
fig, ax = plt.subplots()
ax.plot(x, x, label='x=x')
ax.plot(x, x**2, label='x=x**2')
ax.plot(x, x**3, label='x=x**3')
ax.set_xlabel('x label')
ax.set_ylabel('y label')
ax.set_title("Simple Plot")
ax.legend()
plt.show()

12. © 2008 Haim Michael 20150729
The Interactive Mode
 We can turn on the interactive mode by calling the ion()
function.
 Doing so when using a Python console we will be able to
continue the execution of more statements in the Python
Console and while doing so, get to see the immediate
outcome.

13. © 2008 Haim Michael 20150729
The Interactive Mode

14. © 2008 Haim Michael 20150729
The plot() Function
 The plot() method that was defined inside the
matplotlib.pyplot module can be invoked in various
ways.
 The plot() method that was defined inside the
matplotlib.pyplot module can be invoked in various
ways.

15. © 2008 Haim Michael 20150729
The plot() Function
import matplotlib.pyplot as plt
import numpy as np
t = np.arange(0, 4, 0.1)
plt.plot(t, t, 'g--', t, t**2, 'bs', t, t**3, 'r^')
plt.show()

16. © 2008 Haim Michael 20150729
Q & A
 Thanks!
haim.michael@lifemichael.com
054-6655837
http://blog.lifemichael.com