[Numpy-discussion] Why the upcasting?
Benyang Tang
btang at pacific.jpl.nasa.gov
Wed Jun 12 09:35:05 CDT 2002
The sum of an Int32 array and a Float32 array is a Float64 array, as shown by the following code:
a = Numeric.array([1,2,3,4],'i')
a.typecode(), a.itemsize()
b = Numeric.array([1,2,3,4],'f')
b.typecode(), b.itemsize()
c=a+b
c.typecode(), c.itemsize()
>>> a = Numeric.array([1,2,3,4],'i')
>>> a.typecode(), a.itemsize()
('i', 4)
>>>
>>> b = Numeric.array([1,2,3,4],'f')
>>> b.typecode(), b.itemsize()
('f', 4)
>>> c=a+b
>>> c.typecode(), c.itemsize()
('d', 8)
Why is the upcasting?
I am using Linux/Pentium/python2.1/numpy20 .
Thanks.
Benyang Tang
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