CODEWITHSUNDEEP
pythonstringintgeometry
user3151828
user3151828

Reputation: 363

Circle Graphing Program

I am trying to make a program that graphs a circle using radius and center coordinates that the user inputs. This is what I have so far

import numpy as np
import matplotlib.pyplot as plt
def circle(r,h,k,domain):
    x = np.array(domain)
    y = eval(np.sqrt(r**2 - (x-h)**2) + k)
    plt.plot(x,y)
    plt.show

rad = input("Radius: ")
xcen = int(input("Center X Coordinate: "))
ycen = int(input("Center Y Coordinate: "))

circle(rad,xcen,ycen,np.linspace(-10,10,500))
print("Done")

When I run it I get an error concerning the line y = eval(np.sqrt(r**2 - (x-h)**2) + k)

Radius: 5
Center X Coordinate: 0
Center Y Coordinate: 0
Traceback (most recent call last):
  File "/Users/William/Documents/Science/PYTHON3/Circle.py", line 13, in <module>
    circle(rad,xcen,ycen,np.linspace(-10,10,500))
  File "/Users/William/Documents/Science/PYTHON3/Circle.py", line 5, in circle
    y = eval(np.sqrt(r**2 - (x-h)**2) + k)
TypeError: unsupported operand type(s) for ** or pow(): 'str' and 'int'
>>>

What does this mean? Why is it saying str and int can't be used with **

Upvotes: 0

Views: 131

Answers (1)

Kevin
Kevin

Reputation: 76244

rad = input("Radius: ")

In Python 3.X, the result returned by input is a string. That string is then passed to circle, which you try to square. But you can't square a string.

Convert rad to a number before using it.

rad = float(input("Radius: "))

Upvotes: 3

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