[e-lang] Is it done?

Ben Laurie benl at google.com
Tue Jan 1 08:14:16 EST 2008


On Jan 1, 2008 7:34 AM, Mark Miller <erights at gmail.com> wrote:
> On Dec 31, 2007 9:54 PM, Kevin Reid <kpreid at mac.com> wrote:
> > > (mismatch (file #P"/Users/erights/svn-other/e-on-cl/tests/
> > > numbers.updoc")
> > >           (source "def x := 2.0 ** -0.5")
> > >           (expects ("value" "0.7071067811865476"))
> > >           (instead ("value" "0.7071067811865475")) (opt-backtrace
> > > nil))
> >
> > This is the floating-point problem I mentioned. I believe that
> > 0.7071067811865475 is actually the correct answer; please verify this.
>
> E-on-Java does give 0.7071067811865475. For this case, E-on-Java
> simply delegates to Java's StrictMath.pow(), which is supposed to use
> IEEE double precision with round-to-even. I'm not sure what else to do
> to verify this.

$ bc
bc 1.06
Copyright 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc.
This is free software with ABSOLUTELY NO WARRANTY.
For details type `warranty'.
scale=100
1/sqrt(2)
.7071067811865475244008443621048490392848359376884740365883398689953\
662392310535194251937671638207863

> Since this kind of thing may be sensitive to platform issues at
> several levels of abstraction, for the record, my "rune --version"
> prints
>
> E version: 0.9.1c at /Users/erights/ehome/
> on Java version: 1.5.0_07 at
> /System/Library/Frameworks/JavaVM.framework/Versions/1.5.0/Home
> on OS: Mac OS X version: 10.4.11 on i386 (mac/x86)
> for erights in US
>
>
>
> --
> Text by me above is hereby placed in the public domain
>
>     Cheers,
>     --MarkM
>
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