dtype always copies
Stefan van der Walt
stefan at sun.ac.za
Fri Oct 13 10:28:25 EDT 2006
Hi all,
I've noticed that 'astype' always forces a copy. Is this
behaviour intended? It seems to conflict with 'asarray', that
tries to avoid a copy.
For example, when wrapping code in ctypes, the following snippet
would have been useful:
def foo(x):
# ensure x is an array of the right type
x = N.ascontiguousarray(x).astype(N.intc)
but that will cause a copy, so you'll have to do
def foo(x):
try:
x = N.ascontiguousarray(x,N.intc)
except:
x = N.ascontiguousarray(x).astype(N.intc)
Maybe I'm missing something obvious here -- any pointers?
Thanks
Stéfan
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