Create and plot fix of slopes between points

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Create and plot fix of slopes between points

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#1 by (5 votes)

4

Good afternoon everyone, I'm trying to create an array with numpy that contains the slope between each of the points made with the arrays x e y to finally graph them with matplotlib .

These are the steps that I am currently following:

1. I calculate the slope for each of the points.

2. I add each calculated slope to a list.

3. The resulting list is transformed into an array of numpy .

4. Graph that array with matplotlib.

This is my code:

#!/usr/bin/python
# -*- coding: utf-8 -*-
import numpy as np
import matplotlib.pyplot as plt
x = np.array([0,1,2,3,4,5,6])
y = np.array([0,1,2,3,2,1,0])
lista = []
for i in range(len(x)-1):
    dy = (y[i+1]-y[i]) / (x[i+1] - x[i])
    lista.append(dy)
pendiente = np.asarray(lista)
ejex = len(x)-1
plt.plot(ejex,pendiente,'-m')
plt.show()

Does anyone know a better way to do this?

Thank you very much.

python array numpy matplotlib

asked by Carlos Hernandez 25.01.2016 в 00:33

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1 answer

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score 5 · Accepted Answer

You could use np.diff for the differences and Then do the division. The result is a numpy.ndarray , so you do not have to convert it.

import numpy as np
import matplotlib.pyplot as plt
x = np.array([0,1,2,3,4,5,6])
y = np.array([0,1,2,3,2,1,0])
pendiente = np.diff(y) / np.diff(x)
plt.plot(pendiente, '-m')
plt.show()