TypeError when Using NumPy and Floats in Python Functions

Question

I am trying to write a function to plot a sine graph. The function takes three sine arguments: amplitude being A, frequency being B, horizontal shift being C (see below)

A sin(B(x-C))

This is my code:

import numpy as np
import matplotlib.pylab as plt

x = np.linspace(-np.pi, np.pi, 201)


def sine(amplitude, frequency, horizontal_shift) -> object:
    si = np.sin(x - sine)
    si = si * frequency
    si = amplitude * si
    return si


test = sine(4, 1, 2)
print(test)

plt.plot(x, test)
plt.show()

However, I keep getting this error:

TypeError: unsupported operand type(s) for -: 'float' and 'function'

I have tried to

input ints only
input numbers as strings
defining my function as this:

def sine(amplitude, frequency, horizontal_shift) -> object

but I get the same error.

What is x - sine supposed to be doing? sine is the function that you just defined. Math isn't defined for functions! — hpaulj
– hpaulj, Commented Nov 29, 2021 at 20:47

havingaball · Accepted Answer · 2021-11-29 18:06:35Z

1

Couple of things. Firstly you don't want si = np.sin(x - sine). This is what the traceback is referring to. Secondly, your function even then isn't doing the calculation that you gave at the top. Try:

def sine(x, amplitude, frequency, horizontal_shift):
    si = amplitude * np.sin(frequency * (x - horizontal_shift))
    return si

Edit: plot of sample output

plt.plot(np.linspace(-np.pi, np.pi, 201), sine(np.linspace(-np.pi, np.pi, 201), 2 , 5, 7))

answered Nov 29, 2021 at 18:06

havingaball

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