xscottg at yahoo.com
Tue Apr 16 16:38:02 CDT 2002
--- Perry Greenfield <perry at stsci.edu> wrote:
> If one had an NDArray that happened to contain a type that numarray
> supported, yes it is possible (in fact RecArray does that sort of thing).
> If your point is that in doing so one must use the private attributes
> such as _strides, yes that is true.
My point was simply:
= One *can* convert from (NDArray + typecode) to a full NumArray
= You *do* already convert lists, tuples, ... to NumArrays in ufuncs
= So you *could* convert *(NDArrays + typecode) to NumArrays in ufuncs
in the same place that checks to see if it is a list, tuple, ...
= You possibly *could* standardize the attributes in an NDArray
(buffer, typecode, shape, stride, offset, ...)
= If you *did* standardize the attributes, then others *could*
build UserDefinedNDArrays however they see fit and they would
work with NumArrays
However I get the sense that the numarray module is your baby, and you
don't want to change him too much. That's very understandable, you're a
proud parent. Truth be told, he's a good looking kid, and I look forward
to hanging out with him when he's all grown up. We just have a little
different view on parenting, and I was hoping my kid would have an easier
time playing with yours.
Now that I've beaten that silly metaphor to death... :-)
ps: It occurs to me, with the strong sense of encapsulation you desire,
that I could have presented this better as requesting that you specify a
set of standard *methods* instead of attributes. Something like:
# Who knows what the real list would consist of...
# We never got to discuss what a really general
# purpose description of an NDArray would require...
Then anything which implemented those standard *methods* would be a viable
NDArray. From my point of view it amounts to about the same thing, but I
think it's a better design and that you might like this idea more.
However I'm getting out of breath on this topic, and I have other things
I need to do (I'm sure this is true for you too), so if you don't see any
merit in this idea, I won't push for it any further.
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