converting from numpy array of one type to another by re-interpreting raw bytes

Question

Is there any way to do a "reinterpret_cast" with numpy arrays? Here's an example:

>>> import numpy as np
>>> x=np.array([105,79,196,53,151,176,59,202,249,0,207,6], dtype=np.uint8)
>>> np.fromstring(x.tostring(),'<h')
array([ 20329,  13764, -20329, -13765,    249,   1743], dtype=int16)

I can call tostring() and then fromstring() to convert from an array to raw bytes and then back to another array. I'm just wondering if there's a way for me to skip the intermediate step. (not that it's a big deal, I would just like to understand.)

unutbu · Accepted Answer · 2014-03-25 00:25:44Z

19

Yes. When you view an array with a different dtype, you are reinterpreting the underlying data (zeros and ones) according to the different dtype.

In [85]: x.view('<i2')
Out[85]: array([ 20329,  13764, -20329, -13765,    249,   1743], dtype=int16)

answered Mar 25, 2014 at 0:25

unutbu

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