On Sat, Mar 5, 2011 at 8:09 AM, Russell E. Owen <ro...@uw.edu> wrote: > The page <http://docs.scipy.org/doc/numpy/user/basics.rec.html> > > gives a good introduction to structured arrays. However, it says nothing > about how to set a particular element (all fields at once) from a > collection of data. > > For instance: > > stArr = numpy.zeros([4,5], dtype=[("pos", float, (2,)), ("rot", float)]) > > The question is how to set stArr[0]? > > >From experimentation it appears that you can provide a tuple, but not a > list. Hence the following works just fine (and that the tuple can > contain a list): > strArr[0,0] = ([1.0, 1.1], 2.0) > > but the following fails: > strArr[0,0] = [[1.0, 1.1], 2.0] > with an error: > TypeError: expected a readable buffer object > > This is useful information if one is trying to initialize a structured > array from a collection of data, such as that returned from a database > query. > I'm wondering if that's not a bug? If it's intentional then it is certainly counterintuitive.
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