使用 Matplotlib 和系数绘制多项式

问题描述

我的代码是:

import numpy as np
import matplotlib as plt
polyCoeffiecients = [1,2,3,4,5]
plt.plot(PolyCoeffiecients)
plt.show()

结果是描述 1,2,3,4,5 中的点和它们之间的直线的直线，而不是具有 1,2,3,4,5 的 5 次多项式其系数(P(x)= 1 + 2x + 3x + 4x + 5x)

The result for this is straight lines that describe the points in 1,2,3,4,5 and the straight lines between them, instead of the polynomial of degree 5 that has 1,2,3,4,5 as its coeffiecients ( P(x) = 1 + 2x + 3x + 4x + 5x)

我应该如何绘制仅包含系数的多项式?

How am i suppose to plot a polynomial with just its coefficients?

推荐答案

Eyzuky，看看这是否是您想要的:

Eyzuky, see if this is what you want:

import numpy as np
from matplotlib import pyplot as plt

def PolyCoefficients(x, coeffs):
    """ Returns a polynomial for ``x`` values for the ``coeffs`` provided.

    The coefficients must be in ascending order (``x**0`` to ``x**o``).
    """
    o = len(coeffs)
    print(f'# This is a polynomial of order {ord}.')
    y = 0
    for i in range(o):
        y += coeffs[i]*x**i
    return y

x = np.linspace(0, 9, 10)
coeffs = [1, 2, 3, 4, 5]
plt.plot(x, PolyCoefficients(x, coeffs))
plt.show()

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