dual 2.5Ghx G5
OSX 10.3.9
Values are in GFLOPS, so larger values are better.
Python's numarray module and Io's Vector object were used.

io  2.31

python  0.4

mean

io  0.41

python  0.13

minusEquals

io  2

python  0.48

minusEqualsScalar

io  0.67

python  0.55

plusEquals

io  2.5

python  0.49

plusEqualsScalar

io  0.61

python  0.54

rms

io  0.81

python  0.03

sin

io  0.28

python  0.00059

square

io  4.29

python  0.04

timesEquals

io  2.31

python  0.03

timesEqualsScalar

io  3.33

python  0.05

versions

Io 20050531
Python 2.3.0 final 0