Plot graph for a cylinder

Question

I am trying to plot a graph for a cylinder. Here are my functions for finding volume of the cylinder which is v(r,h)= pi*r^2*h . I don't know how to plot since this is my first attempt with python but these are my codes so far.

def compute_cylinder_area(r,h):
    h = float(h)
    pi = 3.14159
    surface_area = 2 * pi * r ** 2 + 2 * pi * r * h
    return surface_area
h=4
r =array([1,2,3,4,5])
r_new = 3
r_new = float(r_new)
print(compute_cylinder_area(r_new,h))
print(compute_cylinder_area(r,h))

How can I create a plot of radius( x-axis ) versus cylinder volume ( y axis ) with the volume of cylinder with height 2,4 and 6 and the radius ranging from 0.0 to 10.0 . Also, how can I plot 3 volume curves as a function of radius on the figure?? I also need to label each curve and add axis label and a legend to the figure.

Answer 1

Once you have a list of x_values and y_values , use

import matplotlib.pyplot as plt
fig, ax = plt.subplots(1, 1)
ax.plot(x_values, y_values)
fig.show()

You can also do this an interactive fashion to plot on the "active" axes, but the object-oriented approach shown here will be more effective in teaching you programming skills. Read more about the plot function at http://matplotlib.org/ where you can enter plot into the search box at the right and follow the link the method of an Axes: matplotlib.axes.Axes.plot