That Linux Squeak 2.3 float error again
Jarvis, Robert P.
Jarvisb at timken.com
Thu Feb 18 19:24:52 UTC 1999
This situation arises because the implementation of Float>>raisedTo: uses
logarithms to calculate the result. On the Windows platform it turns out
that the Microsoft C++ runtime lib gives back some unusual results for
exp(log(0.0)), and I believe the folks at Squeak Central are working on
this. In the short term I think the following change to Float>>raisedTo:
should take care of things until a real fix is developed:
"Answer the receiver raised to aNumber."
0.0 = aNumber ifTrue: [^ 1.0].
self = 0.0 ifTrue: [ ^self ]. "*** add this line ***"
^ (self ln * aNumber asFloat) exp
You can also probably do something similar with Number>>raisedTo:,
Number>>raisedToInteger:, and Fraction>>raisedToInteger:. I hope this
The Timken Company
> -----Original Message-----
> From: Richard L. Peskin [SMTP:rlpcon at vermontel.net]
> Sent: Thursday, February 18, 1999 9:05 AM
> To: squeak at cs.uiuc.edu
> Subject: That Linux Squeak 2.3 float error again
> Has anyone verified the float error in Squeak 2.3 Linux, that is the
> 0.0 raisedTo: 0.75 ==> NaN ?
> I am trying to see if it is my system or a primitive error.
> --dick peskin
> R. L. Peskin, Rutgers Univ. ; <peskin at caip.rutgers.edu>;
> VT Phone (802) 824-4558 NJ Phone (732) 445-4208
> "The corporate culture is concerned less with Occam's razor than his
> aftershave lotion."
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