Beefy Boxes and Bandwidth Generously Provided by pair Networks DiBona
There's more than one way to do things
 
PerlMonks  

How do I create/detect/handle Infinity?

( #783071=categorized question: print w/ replies, xml ) Need Help??
Contributed by jdporter on Jul 24, 2009 at 18:11 UTC
Q&A  > math


Description:

N/T

Answer: How do I create/detect/handle Infinity?
contributed by shmem

Creating Inf/NaN:

use Devel::Peek; $inf = (~@~)**(~@~); $nan = $inf / $inf; Dump $_ for $inf, $nan; __END__ SV = NV(0x9e15f84) at 0x9dfc11c REFCNT = 2 FLAGS = (NOK,pNOK) NV = inf SV = NV(0x9e15f9c) at 0x9dfc59c REFCNT = 2 FLAGS = (NOK,pNOK) NV = nan

Detecting Inf/NaN: since they are numeric values, Inf and NaN can be tested for with the numeric equality/inequality operators == and !=. For Inf, greater and less also work.

Handling: not useful ;-)

Devel::Peek

Answer: How do I create/detect/handle Infinity?
contributed by moritz

I think in Perl 5 this is platform specific, so I'll rather give the Perl 6 answer:

my $num = Inf; given $num { say "+Inf" when Inf; say "-Inf" when -Inf; say "NaN" when NaN; }

Works in Rakudo today.

Please (register and) log in if you wish to add an answer



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • Outside of code tags, you may need to use entities for some characters:
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others musing on the Monastery: (10)
    As of 2014-04-16 06:22 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      April first is:







      Results (416 votes), past polls