[Numpy-discussion] ndarray from column data
Elaine Angelino
elaine.angelino@gmail....
Wed Jul 1 20:02:53 CDT 2009
Hi there --
Is there a fast way to make a numpy ndarray from column data?
For example, suppose I want to make an ndarray with 2 rows and 3 columns of
different data types based on the following column data:
C0 = [1,2]
C1 = ['a','b']
C2 = [3.3,4.4]
I could create an empty ndarray and fill the columns one by one:
X = numpy.core.ndarray((2,), dtype='<i4,|S1,<f8')
X['f0'] = C0
X['f1'] = C1
X['f2'] = C2
The result is the same as:
X = numpy.array([(1,'a',3.3), (2,'b',4.4)], dtype='<i4,|S1,<f8')
but I would like to make X directly from the column data.
[ I know that numpy.core.records.fromarrays will produce a numpy recarray
from column data, but this of course is a recarray and not a ndarray! For
ex:
X = numpy.numpy.core.records.fromarrays([C0,C1,C2]) ]
Thanks for any help,
Elaine
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