Graphs Cookbook

Drawing a bar chart Drawing a box plot Drawing a function Drawing a histogram Drawing a horizontal line Drawing a line plot Drawing a normal curve Drawing a scatterplot Drawing a single point Drawing a stacked bar chart Drawing a vertical line Drawing arrows Drawing circles Drawing empty circles Drawing error bars Drawing horizontal bar plots Drawing multiple histograms in one plot Normalizing a histogram Plotting scatter plot with category

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Drawing a function in Matplotlib

Programming

Python

Matplotlib

Cookbooks

Graphs Cookbook

Jul 1, 2022

Last updated

local_offer Python●Matplotlib

Drawing a parabola

To draw a parabola (y=x**2):


        
        
            
                
                
                    import matplotlib.pyplot as plt

x = np.linspace(-10, 10, 1000)        # Domain from -10 to 10 with 1000 data-points
plt.title("Parabola $y=x^2$")
plt.xlabel("$x$", fontsize=14)
plt.ylabel("$y$", fontsize=14)
plt.plot(x, x**2)

The output is as follows:

Helper function to draw functions


        
        
            
                
                
                    def my_func(x):
       return x**2

def plot_function(x_lim, my_func):
       """
       @param x_lim {Array} an array of size two that contains the lower and upper x limits
       @param my_func {Function} the function that we want to plot
       """
       x = np.linspace(x_lim[0], x_lim[1], 1000)
       plt.xlabel("$x$", fontsize = 14)
       plt.ylabel("$y$", fontsize = 14)
       plt.plot(x, my_func(x))

We can use plot a curve like so:


        
        
            
                
                
                    plot_function([-10,10], my_func)

The output is as follows:

Published by Isshin Inada

Edited by 0 others

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