2

所以这里我有 x1vals:

>>> x1Vals
[-0.33042515829906227, -0.1085082739900165, 0.93708611747433213, -0.19289496973017362, -0.94365384912207761, 0.43385903975568652, -0.46061140566051262, 0.82767432358782367, -0.24257307936591843, -0.1182761514447952, -0.29794617763330011, -0.87410892638408, -0.34732294121174467, 0.40646145339571249, -0.64082861589870865, -0.45680189916940073, 0.4688889876175073, -0.89399689430691298, 0.53549621114138612]

这是我要选择的 x1Vals 索引列表

>>> np.where(np.dot(XValsOnly,newweights) > 0)

>>>(array([ 1,  2,  4,  5,  6,  8,  9, 13, 15, 16]),)

但是当我尝试以 Matlab 方式获取 x1Vals 的值时,我收到了这个错误:

>>> x1Vals[np.where(np.dot(XValsOnly,newweights) > 0)]

Traceback (most recent call last):
  File "<pyshell#69>", line 1, in <module>
    x1Vals[np.where(np.dot(XValsOnly,newweights) > 0)]
TypeError: list indices must be integers, not tuple
>>> np.where(np.dot(XValsOnly,newweights) > 0)

有没有解决的办法?

4

1 回答 1

1

问题是你x1Vals是一个list对象,它不支持花哨的索引。您只需要从中构建一个数组:

x1Vals = np.array(x1Vals)

你的方法会奏效。

一种更快的方法是使用np.take

np.take(x1Vals, np.where(np.dot(XValsOnly,newweights) > 0))
于 2013-10-02T07:09:25.087 回答