Beefy Boxes and Bandwidth Generously Provided by pair Networks
Think about Loose Coupling
 
PerlMonks  

Re^3: index of the minimum element of the array

by oiskuu (Friar)
on Jan 17, 2014 at 18:13 UTC ( #1070994=note: print w/ replies, xml ) Need Help??


in reply to Re^2: index of the minimum element of the array
in thread index of the minimum element of the array

Also take a look at List::Util for some basic examples.

use List::Util 'reduce'; sub minindex { reduce { $_[$a] < $_[$b] ? $a : $b } 0 .. $#_ }

Update: Less succinct now when fixed:

use List::Util 'reduce'; sub minindex { my @x=@_; reduce { $x[$a] < $x[$b] ? $a : $b } 0..$#_ }


Comment on Re^3: index of the minimum element of the array
Select or Download Code
Re^4: index of the minimum element of the array
by ikegami (Pope) on Jan 17, 2014 at 18:23 UTC
    You're accessing the callback's @_ when you mean to access minindex's

      I'm passing a block to reduce.

        Ikegami is right, thats not working!

        Better pass the list as a closed over array (here @x)

        DB<109> @a= map { int rand 100 } 1..10 => (96, 10, 99, 9, 43, 8, 20, 85, 42, 26) DB<110> sub minindex { my @x=@_; reduce { $x[$a] < $x[$b] ? $a : $b } 0 .. $#_ } DB<111> print minindex @a 5

        update

        or even better like ikegami now suggested as ref to avoid overhead

        DB<114> @a= map { int rand 100 } 1..10 => (22, 15, 27, 44, 70, 85, +74, 93, 96, 14) DB<115> sub minindex { my $x=\@_; reduce { $x->[$a] < $x->[$b] ? $a : $b } 0 .. $#_ } DB<116> print minindex @a 9

        Cheers Rolf

        ( addicted to the Perl Programming Language)

        Impossible. There's no such data type. You are passing a sub reference to reduce.
        reduce BLOCK LIST
        is compiled as
        &reduce(sub BLOCK, LIST)

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1070994]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others rifling through the Monastery: (14)
As of 2015-07-02 08:45 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (31 votes), past polls