[Numpy-discussion] how to create an array of objects that are sequences?
Travis E. Oliphant
Fri Jan 4 12:55:56 CST 2008
Charles R Harris wrote:
> On Jan 4, 2008 11:13 AM, Pearu Peterson <firstname.lastname@example.org
> <mailto:email@example.com>> wrote:
> On Fri, January 4, 2008 7:33 pm, Travis E. Oliphant wrote:
> > So, create an empty object array and insert the entries the way
> you want
> > them:
> > a = np.empty(1,dtype=object)
> > a = A((1,2))
> Actually this is still an option if to put the above
> to a A.as_array method something like
> class A(tuple):
> def as_array(self):
> import numpy
> obj = numpy.empty(1,dtype=object)
> obj = self
> return obj
> but it would be nice if the __array__ method also worked.
> Could this be something that should be put to issues or
> would it just get a WontFix flag?
> IIRC the previous discussions, there simply isn't enough information
> in the array interface to decide what needs to be done with regards to
> object arrays. I think a general solution would require a specialized
> creation function with more arguments, say, a depth argument which
> would create objects at a certain depth of nesting. In your case that
> would be at level 0(1?). I think that would solve most problems, and I
> suppose it could be added to the current array interface with a
> default value implying current behavior, i.e., as deep as possible.
I like the depth option, and that could be used with the current
interface without too much difficulty, I think.
This question does come up quite often and should probably be addressed.
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