Posted by ImOk on 07/18/06 15:42

Nico,

This is not a PHP problem. I would pose this question in one of the
math or statistical groups.

Once you get the pseudo code in place it should be easy to program it
in PHP.

Nico wrote:
> Hi,
>
> I've created the following sample php code.
>
> Elements<br>
> <?php
> $elements[1]="element1";
> $elements[2]="element2";
> $elements[3]="element3";
> $elements[4]="element4";
> $elements[5]="element5";
> ?>
> Combinations
> <?php
> $combinations[1][1]="element1"; // Combination of element 1 with element
> 2
> $combinations[1][2]="element2";
> $combinations[2][1]="element3"; // Combination of element 1 with element
> 3
> $combinations[2][2]="element1";
> $combinations[3][1]="element4"; // Combination of element 1 with element
> 4
> $combinations[3][2]="element1";
> $combinations[4][1]="element5"; // Combination of element 1 with element
> 5
> $combinations[4][2]="element1";
> ?>
>
> I'd like to define two simple functions:
> countcombinations(a,...;b,...)
> listcombinations(a,...;b,...)
>
> The first function "countcombinations(a,...;b,...)" should count how many
> combinations exist in which "a" and "..." are included and "b" and "..."
> are not included.
>
> Example
> countcombinations(element1;element2,element3)
> Result: 2 ("element1 combined with element4" and "element1 combined with
> element5")
>
> The second function "listcombinations(a,...;b,...)" should list the elements
> combined with "a" and "...", excluding from the list the elements "b" and
> "...".
>
> Example
> listcombinations(element1;element2,element3)
> Result: element4, element5
>
> I've some difficult in defining this two functions.
> Can you help me please?
> Many thanks.
>
> Best,
> Nico

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