dtype.newbyteorder()

dtype.newbyteorder(new_order='S')

Return a new dtype with a different byte order.

Changes are also made in all fields and sub-arrays of the data type.

Parameters:

Parameters:	new_order : string, optional Byte order to force; a value from the byte order specifications below. The default value (?S?) results in swapping the current byte order. `new_order` codes can be any of: ?S? - swap dtype from current to opposite endian {?<?, ?L?} - little endian {?>?, ?B?} - big endian {?=?, ?N?} - native order {?\|?, ?I?} - ignore (no change to byte order) The code does a case-insensitive check on the first letter of `new_order` for these alternatives. For example, any of ?>? or ?B? or ?b? or ?brian? are valid to specify big-endian.
Returns:	new_dtype : dtype New dtype object with the given change to the byte order.

new_order : string, optional

Byte order to force; a value from the byte order specifications below. The default value (?S?) results in swapping the current byte order. new_order codes can be any of:

?S? - swap dtype from current to opposite endian
{?<?, ?L?} - little endian
{?>?, ?B?} - big endian
{?=?, ?N?} - native order
{?|?, ?I?} - ignore (no change to byte order)

The code does a case-insensitive check on the first letter of new_order for these alternatives. For example, any of ?>? or ?B? or ?b? or ?brian? are valid to specify big-endian.

Returns:

new_dtype : dtype

New dtype object with the given change to the byte order.

Notes

Changes are also made in all fields and sub-arrays of the data type.

Examples

>>> import sys
>>> sys_is_le = sys.byteorder == 'little'
>>> native_code = sys_is_le and '<' or '>'
>>> swapped_code = sys_is_le and '>' or '<'
>>> native_dt = np.dtype(native_code+'i2')
>>> swapped_dt = np.dtype(swapped_code+'i2')
>>> native_dt.newbyteorder('S') == swapped_dt
True
>>> native_dt.newbyteorder() == swapped_dt
True
>>> native_dt == swapped_dt.newbyteorder('S')
True
>>> native_dt == swapped_dt.newbyteorder('=')
True
>>> native_dt == swapped_dt.newbyteorder('N')
True
>>> native_dt == native_dt.newbyteorder('|')
True
>>> np.dtype('<i2') == native_dt.newbyteorder('<')
True
>>> np.dtype('<i2') == native_dt.newbyteorder('L')
True
>>> np.dtype('>i2') == native_dt.newbyteorder('>')
True
>>> np.dtype('>i2') == native_dt.newbyteorder('B')
True

Links:

https://docs.scipy.org/doc/numpy-1.11.0/reference/generated/numpy.dtype.newbyteorder.html

doc_NumPy

2017-01-10 18:08:30

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