[Numpy-discussion] sum and mean methods behaviour
jmiller at stsci.edu
Wed Sep 3 14:47:04 EDT 2003
I want to thank everyone who participated in this discussion: Peter,
Fernando, Robert, Paul, Perry, and Tim.
Tim's post has IMO a completely synthesized solution:
1. Add a type parameter to sum which defaults to widest type.
2. Add a type parameter to reductions (and fix output type handling).
Default is same-type as it is now. No major changes to C-code.
3. Add a WidestType(array) function:
Bool --> Bool
Int8,Int16,Int32,Int64 --> Int64
UInt8, UInt16,UInt32,UInt64 --> UInt64 (Int64 on win32)
Float32, Float64 --> Float64
Complex32, Complex64 --> Complex64
The only thing this really leaves out, is a higher performance
implementation of sum/mean which Peter referred to a few times. Peter,
if you want to write a specialized module, we'd be happy to put it in
the add-ons package.
Thanks again everybody,
Todd Miller <jmiller at stsci.edu>
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