[Numpy-discussion] Documentation for dtypes with named fields
Sam.Tygier at hep.manchester.ac.uk
Tue Mar 16 12:04:14 EDT 2010
On Tue, Mar 16, 2010 at 11:34 AM, Skipper Seabold <jsseabold at gmail.com> wrote:
>> so i always get the vales back in the original order. is the by design, or a bug?
> I've been bitten by this before too and asked the same question with
> no response. I think it's just a limitation of the design of
> structured arrays.
i had a hunt for the code. and it seems easy to fix.
its in numpy/core/_internal.py:301
--- numpy/core/_internal.py 2010-03-16 16:01:28.000000000 +0000
+++ numpy/core/_internal.py.old 2010-03-16 16:00:52.000000000 +0000
@@ -298,7 +298,7 @@
def _index_fields(ary, fields):
from multiarray import empty, dtype
dt = ary.dtype
- new_dtype = [(name, dt[name]) for name in fields if name in dt.names]
+ new_dtype = [(name, dt[name]) for name in dt.names if name in fields]
order = 'F'
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