eric.le.bi...@spectro.jussieu.fr wrote:
I initially tried to create a Float_ref class that inherits from
numpy.array, so that objects of the new class behave like numpy.array
in calculations, but also contain an "uncertainty" atribute, but this
is apparently not allowed ("cannot create 'builtin_function_or_method'
instances").
So I thought I'd directly add an attribute to a numpy.array: "x =
numpy.array(3.14); x.uncertainty = 0.01", but this is not allowed
either.
Thus, it is not obvious for me to extend the 1x1 numpy.array object so
that it also contains an "uncertainty" attribute.
Subclassing numpy arrays is possible but it can be a bit fiddly. You
can't add attributes to a numpy array unless it's a subclass.
The first place to look is:
http://www.scipy.org/Subclasses
Actually, I haven't read this (new) page in the numpy docs, but it looks
better:
http://docs.scipy.org/doc/numpy/user/basics.subclassing.html
It also seems to include a simple example of how to write a subclass
that just adds a single attribute.
Dan
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