Error when plotting y function with range of x values

Question

Get this error when trying to plot a function with respect for a range of x values

TypeError: unsupported operand type(s) for *: 'float' and 'range'

import numpy as np
import matplotlib.pyplot as plt
x = range(273, 1273)
print(list(x))
y = -0.7765 + (0.014350 * x) - (0.000012209 * (x ** 2)) + (3.8289e-09 * (x ** 3))
plt.plot(x, y, 'r')
plt.show()

A side note: range returns a generator, which is consumed when you do print(list(x)). That means you cannot use it again later in plt.plot(x,y,'r'). — Quang Hoang
– Quang Hoang, Commented Sep 29, 2020 at 15:30

Vishnudev Krishnadas · Accepted Answer · 2020-09-29 15:28:12Z

1

When you use the function range, it uses python's range function which cannot be used in arithmetic directly as it is an iterator. So you get an error saying multiplication is not supported for: range and float.

When you use NumPy's arange, it has an inbuilt ability to handle such arithmetic. Hence, your code should be using that.

import numpy as np
import matplotlib.pyplot as plt
x = np.arange(273, 1273) # This
y = -0.7765 + (0.014350 * x) - (0.000012209 * (x ** 2)) + (3.8289e-09 * (x ** 3))
plt.plot(x, y, 'r')
plt.show()

answered Sep 29, 2020 at 15:28

Vishnudev Krishnadas

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