DESCRIPTIONClass that implements the avg operator. This operator will compute the average value of a DLF field in a group of DLF records.
If the field used by average isn't a numeric fields, the number of different values in that field will be used as the numerator.
It's possible to compute a weighted average by specifying a weighting field.
By default, the average is a by record average. It's possible to compute a by different values average. The list of fields that's used to determine the different values if speficied in the by-fields attribute.
new( %params )Creates a new Lire::Average object. In addition to the values supported by its parents, the by-fields and weight attributes will be initialized to the values specified in the %params argument.
by_fields( [$new_by_fields] )Returns the fields that are going to be used to count the different values which will made up the by part of the average.
This a reference to an array of DLF field names.
If the $new_by_fields parameter is set, it will be used as the new $by_fields value. It must be an array reference and should only contains valid field names for the current report specification's schema.
weigth( [$new_weight] )Returns the DLF field's name by which the values will be multiplied before being summed.
You can change the weight field by specifying a new name as the $new_weight parameter. Use undef to remove the use of a weighting field.
VERSION$Id: Average.pm,v 1.17 2008/03/09 19:27:30 vanbaal Exp $
COPYRIGHTCopyright (C) 2001-2004 Stichting LogReport Foundation [email protected]
This file is part of Lire.
Lire is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
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