当我编写以下代码时,我得到以下错误。 我做错什么了??你知道吗
def f(t):
return np.sin(t**2)
n = 20 # number of points for Riemann integration
a = 0; b = 2
P = np.linspace(a, b, n) # Standard partition constant width
dt = (b-a)/n
T = [np.random.rand()*dt + p for p in P[:-1]] # Randomly chosen point
plt.figure(figsize=(10,10))
plt.plot(T, f(T), '.', markersize=10)
plt.bar(P[:-1], f(T), width=dt, alpha=0.2, align='edge')
x = np.linspace(a, b, n*100) # we take finer spacing to get a "smooth" graph
y = f(x)
plt.plot(x, y)
plt.title('Riemann sum with n = {} points'.format(n))
plt.axis('off')
plt.show()
最后我得到以下错误:
Traceback (most recent call last):
File "riman.py", line 35, in <module>
plt.plot(T, f(T), '.', markersize=10)
File "riman.py", line 11, in f
return np.sin(t**2)
TypeError: unsupported operand type(s) for ** or pow(): 'list' and 'int'
错误消息是不言自明的–没有为内置的
list
类型定义幂运算符**
。你知道吗它们被定义为
np.array
:修正:
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