R on the Zaurus
(Actually, I believe this little test was suggested by Peter Dalgaard... I sent Simon the 'correct results' to compare with the Zaurus output... Stuart Leask)
Hello All, I have a working port of R on my SL5500. I've not tested the X windowing support yet, but was more concerned about the accuracy of the fp
emulation.
The following is the result of the test which Stuart Leask recommended I should try: Mandrake 8.2
x<-NA is.na(x)
[1] TRUE
x+1
[1] NA
2*x
[1] NA Zaurus OZ3
x<-NA is.na(x)
[1] TRUE
x+1
[1] 1
2*x
[1] 8.29488e-311 Presumably this is the wrong answer. The question is whether it's the
fault
of the Zaurus' fp emulation, or some sort of incompatibility with the way
R
is written. Does anyone know for certain which it might be? If it is a bug in the Zaurus' fp implementation then I don't see any real troubles getting it fixed (I'm sure people will be keen to get this
right).
I notice that there are two types of NaNs in the ieee 754 standard, QNaN (Quiet NaN) and SNaN (Signalling NaN). Does 8.29488e-311 look familiar (I didn't think so)? Regards, Simon -------------------------------------------- Simon Pickering MEng Dept. of Mechanical Engineering University of Bath Bath, BA2 7AY, UK Tel: +44 (0)1225 383314 Fax: +44 (0)1225 386928 -------------------------------------------- -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.
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