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# Python绘制股票移动均线的实例

1. 前沿

2. numpy.convolve

numpy.convolve(a, v, mode='full')

Returns the discrete, linear convolution of two one-dimensional sequences.

The convolution operator is often seen in signal processing, where it models the effect of a linear time-invariant system on a signal [R17]. In probability theory, the sum of two independent random variables is distributed according to the convolution of their individual distributions.

If v is longer than a, the arrays are swapped before computation.

Parameters:

a : (N,) array_like

First one-dimensional input array.

v : (M,) array_like

Second one-dimensional input array.

mode : {‘full', ‘valid', ‘same'}, optional

‘full':

By default, mode is ‘full'. This returns the convolution at each point of overlap, with an output shape of (N+M-1,). At the end-points of the convolution, the signals do not overlap completely, and boundary effects may be seen.
‘same':

Mode same returns output of length max(M, N). Boundary effects are still visible.
‘valid':

Mode valid returns output of length max(M, N) - min(M, N) + 1. The convolution product is only given for points where the signals overlap completely. Values outside the signal boundary have no effect.

Returns:

out : ndarray

Discrete, linear convolution of a and v.

eg:

>>> import numpy as np
>>>
>>> np_list = np.array([1, 2, 3, 4, 5, 6, 7, 8, 9])
>>>
>>> np_list
array([1, 2, 3, 4, 5, 6, 7, 8, 9])
>>> x = np.convolve(np_list, 2)
>>> x
array([ 2, 4, 6, 8, 10, 12, 14, 16, 18])
>>> x = np.convolve(np_list, [0.5, 0.5])
>>> x
array([ 0.5, 1.5, 2.5, 3.5, 4.5, 5.5, 6.5, 7.5, 8.5, 4.5])

3. 移动均线计算

def moving_average(x, n, type='simple'):
x = np.asarray(x)
if type == 'simple':
weights = np.ones(n)
else:
weights = np.exp(np.linspace(-1., 0., n))

weights /= weights.sum()

a = np.convolve(x, weights, mode='full')[:len(x)]
a[:n] = a[n]
return a
ma10 = moving_average(close_data, 10, 'simple')
ma20 = moving_average(close_data, 20, 'simple')

ax1.plot(data['date'], ma10, color='c', lw=2, label='MA (10)')
ax1.plot(data['date'], ma20, color='red', lw=2, label='MA (20)')

4. 效果图

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