Re^2: Best Material for Floors: (POSIX--)


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by tye (Sage)

on Dec 01, 2007 at 05:32 UTC ( [id://654279]=note: print w/replies, xml )

Need Help??

Bleh. POSIX::floor() on a Perl that uses "long double" (or similar) as NVs induces a great reduction in precision. Much better to just use:

sub floor { $_[0] < 0 ? -int(-$_[0]) : int($_[0]); }
[download]

sub floor { my $i= int( my $f= shift @_ ); return $i - ( $f<0 && $f!=$
+i ); }
[download]

Now you know. :)

Comment on Re^2: Best Material for Floors: (POSIX--) Select or Download Code

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Re^3: Best Material for Floors: (POSIX--) by lidden (Curate) on Dec 01, 2007 at 11:04 UTC
`floor -2.5` Should return -3.	[reply] [d/l]
Re^4: Best Material for Floors: (POSIX--) by tye (Sage) on Dec 01, 2007 at 15:38 UTC
Heh, thanks. Fixed. Since I discovered the problem working with really large numbers, even my previous version was tons more accurate than POSIX::floor in that particular situation so it fixed the problem. That's how bad POSIX::floor can be. - tye	[reply]

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