On 7 March 2011 15:29, Christopher Barker <chris.bar...@noaa.gov> wrote: > On 3/7/11 11:18 AM, Francesc Alted wrote: > >> but, instead of returning a numpy array of 'object' elements, plain >> python lists are returned instead. > > which gives you the append option -- I can see how that would be > usefull. Though I'd kind of like to have numpy ufunc/broadcasting > performance. i.e.: > > vlarray * some_constant > > Be fast, and work out of the box!
How about this? Represent them as object arrays (or lists) of variable-length 1d arrays. But create the 1d arrays by building one large 1d array with them all concatenated, then taking slices. Keep the single array around, perhaps in an attribute of the object array; after all, most of the numpy operations are elementwise and don't care about array structure. You'd want to be able to convert between a flat array plus length vector and object array in some reasonably efficient manner, and I think this allows that. Anne _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
