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### Re: Variant permutation

by hossman (Prior)
 on Aug 31, 2003 at 07:29 UTC ( #287994=note: print w/replies, xml ) Need Help??

I'm curious...

1. Why do you need these "Variant permutations" ? ... is there a practicle use for this, or are you just interested from a theoreticaly standpoint?
2. Why are you limiting yourself to (what i would call) "permutation prefixes" ?

If you asked me to "to report the partial permutation of the values...

```a b c
1 2 3
x y z
```
...my list would include "ax", "1x", "1", "x", etc.

Replies are listed 'Best First'.
Re: Re: Variant permutation
by gmax (Abbot) on Aug 31, 2003 at 09:37 UTC

An example would be better than any explanation.

```my \$headers = {
locations   => ['USA', 'UK'],
departments => ['pers', 'dev','sales'],
gender      => ['m', 'f']
};

__END__
The ultimate goal will be

USA                                UK
+
---------------------------------- ---------------------------------
pers     dev     sales     USA     pers     dev     sales     UK
-------- ------- --------- ------- -------- ------- --------- ------
m f pers m f dev m f sales m f USA m f pers m f dev m f sales m f UK
- - ---  - - --- - - ----- - - --- - - ---- - - --- - - ----- - - --

a b c    d e f   g h i     j k l   m n o    p q r   s t u     v w x

Take this schema, and see why I said that order is important and I take the variation only when the last one is changing.

For every location I list the departments; for each department a breakdown by gender (columns a b d e n o p q s t), followed by a department total (columns c f i o r u). Then there is a breakdown by location (columns g h v w) with its grand total (columns l x).

If I permute 'USA'-'m' before 'USA'-'pers'-'m' I am breaking the schema.

The algorithm I am dealing with is a little more complex than this, since it is taking information about where to find each item, and generating code to retrieve the relevant data from a database.

The permutations are needed to create the appropriate conditions for retrieving each column of data. All the conditions are merged together into a giant SQL statement that will fetch the data according to my instructions (SUM, COUNT, AVG).

More on this subject when I adjust nicely all the above into a module. :)

``` _  _ _  _
(_|| | |(_|><
_|
```

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