如何⽤python画函数_如何⽤python画常值函数？你好。
import numpy as np
import math
import matplotlib as mpl
import matplotlib.pyplot as plt
def calc_e_small(x):
n = 10
f = np.arange(1, n+1).cumprod()
b = np.array([x]*n).cumprod()
return np.sum(b / f) + 1
def calc_e(x):
reverse = False
if x < 0: # 处理负数
x = -x
reverse = True
ln2 = 0.69314718055994530941723212145818
c = x / ln2
a = int(c+0.5)
b = x - a*ln2
y = (2 * a) calc_e_small(b)
if reverse:
return 1/y
return y
if name == "main":
t1 = np.linspace(-2, 0, 10, endpoint=False)
t2 = np.linspace(0, 3, 20)
t = np.concatenate((t1, t2))
print(t) # 横轴数据linspace numpy
y = np.empty_like(t)
for i, x in enumerate(t):
y[i] = calc_e(x)
print('e^', x, ' = ', y[i], '(近似值)\t', p(x), '(真实值)')
print '误差：', y[i] - p(x)

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