How to make my program ask for user input when graphing linear equations

Question

I am making an algebra calculator for my CSSE (Computer Science and Software Engineering) class and I am having trouble with a portion of my project. I am trying to have my program ask the user for some input to so it can graph the given equation. I do have it set up to where it graphs an already set equation.

I have already tried making the "y = " variable ask for user input but nothing seems to be working.

# Juan Salcedo
# Plotting linear graphs
# April 26, 2019

# Calling necessary libraries
import matplotlib.pyplot as plt
import numpy as np

# Defining x and y
x = np.linspace(-5, 5, 100)
y = 2*x+1

# Calling variables x and y
# Colouring graph "red" and labeling graph
plt.plot(x, y, '-b', label='y=2x+1')

#  Titling plot
plt.title('Graph of y=2x+1')

# Colouring graph in hex
plt.xlabel('x', color='#1C2833')
plt.ylabel('y', color='#1C2833')

# Giving legend
plt.legend(loc='upper left')
plt.grid()

# Calling/showing plot
plt.show()

i don't see the ' "y = " variable ask for user input' , the y statement here only defines y, it doesn't ask for input — Jessica, Apr 26 '19 at 23:59

score 0 · Answer 1 · answered Apr 26 '19 at 23:59

If you just want to get input from the command line, do this:

y = input("Enter your equation: ")

The built-in function input() will pause the program until the user types something and presses Enter, and then returns whatever they typed as a string. So if I were to type "2*x+1", you'd end up with y = "2*x+1". Make sure your program can either handle the string, or take whatever information you need out of the string.

How to make my program ask for user input when graphing linear equations

1 Answers1