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Visit this page for full documentation on simple plots using pyplot.

import numpy as np
import matplotlib.pyplot as plt

# Evenly sampled time from 0s to 10s at 200ms intervals
t = np.arange(0.0, 10.0, 0.2)

# Plotting t at x-axis and sin(t) at y-axis
plt.plot(t, np.sin(t))

# Naming the title and both axis
plt.title('Sinus function')
plt.ylabel('sin(t)')
plt.xlabel('t [s]')

# Need to call the show() function at the end to display my figure
plt.show()

import numpy as np
import matplotlib.pyplot as plt


# Evenly sampled time at 200ms intervals
t = np.arange(0.0, 5.0, 0.2)

# plot() can plot several lines in the same figure. To seperate the different lines 
# from eachother, we may change the line style and format strings.
# See the plot() documentation for a complete list of line styles and format strings.
# The following lines have red dashes, blue squares and green triangles
plt.plot(t, t, 'r--', label='Linear line')
plt.plot(t, t**2, color='blue', linestyle='none', marker='s', label='Second degree polynom')
plt.plot(t, t**3, 'g^', label='Third degree polynom')

# To describe our plot even more detailed we can draw the labels we previously gave our lines using legend.
plt.legend(loc='upper left')

# The function axis() sets the axis sizes, and takes the argument [xmin, xmax, ymin, ymax]
plt.axis([0, 5, 0, 100])

plt.title('Mulitple polynoms')
plt.show()

More in-depth plot() documentation and legend() documentation.

More in-depth quiver documentation and functions.

import numpy as np
import matplotlib.pyplot as plt


# X and Y define the arrow locations
X = np.arange(-10, 10, 1)
Y = np.arange(-10, 10, 1)

# U and V define the arrow directions, respectively in x- and y-direction
# meshgrid() returns coordinate matrices from coordinate vectors
U, V = np.meshgrid(X, Y)

plt.quiver(X, Y, U, V)
plt.title('Simple quiver plot')
plt.show()