本文整理匯總了Python中numpy.core.numerictypes.cdouble方法的典型用法代碼示例。如果您正苦於以下問題：Python numerictypes.cdouble方法的具體用法？Python numerictypes.cdouble怎麽用？Python numerictypes.cdouble使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類numpy.core.numerictypes的用法示例。
在下文中一共展示了numerictypes.cdouble方法的1個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Python代碼示例。
示例1: _tocomplex
# 需要導入模塊: from numpy.core import numerictypes [as 別名]
# 或者: from numpy.core.numerictypes import cdouble [as 別名]
def _tocomplex(arr):
"""Convert its input `arr` to a complex array.
The input is returned as a complex array of the smallest type that will fit
the original data: types like single, byte, short, etc. become csingle,
while others become cdouble.
A copy of the input is always made.
Parameters
----------
arr : array
Returns
-------
array
An array with the same input data as the input but in complex form.
Examples
--------
First, consider an input of type short:
>>> a = np.array([1,2,3],np.short)
>>> ac = np.lib.scimath._tocomplex(a); ac
array([ 1.+0.j, 2.+0.j, 3.+0.j], dtype=complex64)
>>> ac.dtype
dtype('complex64')
If the input is of type double, the output is correspondingly of the
complex double type as well:
>>> b = np.array([1,2,3],np.double)
>>> bc = np.lib.scimath._tocomplex(b); bc
array([ 1.+0.j, 2.+0.j, 3.+0.j])
>>> bc.dtype
dtype('complex128')
Note that even if the input was complex to begin with, a copy is still
made, since the astype() method always copies:
>>> c = np.array([1,2,3],np.csingle)
>>> cc = np.lib.scimath._tocomplex(c); cc
array([ 1.+0.j, 2.+0.j, 3.+0.j], dtype=complex64)
>>> c *= 2; c
array([ 2.+0.j, 4.+0.j, 6.+0.j], dtype=complex64)
>>> cc
array([ 1.+0.j, 2.+0.j, 3.+0.j], dtype=complex64)
"""
if issubclass(arr.dtype.type, (nt.single, nt.byte, nt.short, nt.ubyte,
nt.ushort, nt.csingle)):
return arr.astype(nt.csingle)
else:
return arr.astype(nt.cdouble)