### Comment on

 ( #3333=superdoc: print w/ replies, xml ) Need Help??

G'day Dave,

By alternatively splicing elements from either end of the distribution, I get your original 'qw( A C B A D C A B C A )'.

\$ perl -Mstrict -Mwarnings -E ' my %bag = ( A => 4, B => 2, C => 3, D => 1 ); my @distribution; for my \$key (sort { \$bag{\$b} <=> \$bag{\$a} } keys %bag) { my \$base_offset = int(@distribution / (\$bag{\$key} + 1)); my \$offset = \$base_offset; for (1 .. \$bag{\$key}) { next unless \$_ % 2; splice @distribution, \$offset, 0, \$key; if (\$_ < \$bag{\$key}) { splice @distribution, -\$offset, 0, \$key; } \$offset += \$base_offset + 1; } } say "@distribution"; ' A C B A D C A B C A

If I round up the \$base_offset value, the middle two elements are reversed but everything else remains the same. I don't see this as being more or less uniform but maybe it's more correct.

\$ perl -Mstrict -Mwarnings -E ' my %bag = ( A => 4, B => 2, C => 3, D => 1 ); my @distribution; for my \$key (sort { \$bag{\$b} <=> \$bag{\$a} } keys %bag) { my \$base_offset = int(@distribution / (\$bag{\$key} + 1) + 0.5); + my \$offset = \$base_offset; for (1 .. \$bag{\$key}) { next unless \$_ % 2; splice @distribution, \$offset, 0, \$key; if (\$_ < \$bag{\$key}) { splice @distribution, -\$offset, 0, \$key; } \$offset += \$base_offset + 1; } } say "@distribution"; ' A C B A C D A B C A

I haven't done extensive testing on this solution. Beyond your sample input, I tried:

my %bag = ( A => 4, B => 2, C => 3, D => 1, Z => 1 );

gives: A C B A C D Z A B C A; and

my %bag = ( A => 4, B => 2, C => 3, D => 1, Y => 5, Z => 1 );

gives: Y A C Y B A C Z D Y A B Y C A Y; and

my %bag = ( A => 4, B => 2, C => 3, D => 1, X => 6, Y => 5, Z => 1 );

gives: X Y A X C Y B A X Y Z D C X A B Y C X A Y X; and

my %bag = ( A => 4, B => 2, C => 3, D => 1, W => 4, X => 6, Y => 5, Z +=> 1 );

gives: X Y A W X C Y B A W X Y Z D C X W A B Y C X W A Y X

The above 4 tests all included rounding; without rounding, the results are:

A C B A Z D C A B C A Y A C Y B A C D Z Y A B Y C A Y X Y A C X Y B A C X D Z Y X A B Y X C A Y X X Y A W C X Y B A W C X D Z Y X W A B Y X C W A Y X

-- Ken

In reply to Re: Bag uniform distribution algorithms by kcott
in thread Bag uniform distribution algorithms by davido

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

• Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
• Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
• Read Where should I post X? if you're not absolutely sure you're posting in the right place.
• 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
• You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
 For: Use: & & < < > > [ [ ] ]
• Link using PerlMonks shortcuts! What shortcuts can I use for linking?

Create A New User
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others exploiting the Monastery: (9)
As of 2016-05-26 21:32 GMT
Sections?
Information?
Find Nodes?
Leftovers?
Voting Booth?
What font do you use for programming?

Results (352 votes). Check out past polls.