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<?php
namespace PhpOffice\PhpSpreadsheet\Calculation\Statistical\Averages;
use PhpOffice\PhpSpreadsheet\Calculation\Functions;
use PhpOffice\PhpSpreadsheet\Calculation\Information\ExcelError;
use PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
use PhpOffice\PhpSpreadsheet\Calculation\Statistical\Averages;
use PhpOffice\PhpSpreadsheet\Calculation\Statistical\Counts;
use PhpOffice\PhpSpreadsheet\Calculation\Statistical\Minimum;
class Mean
{
/**
* GEOMEAN.
*
* Returns the geometric mean of an array or range of positive data. For example, you
* can use GEOMEAN to calculate average growth rate given compound interest with
* variable rates.
*
* Excel Function:
* GEOMEAN(value1[,value2[, ...]])
*
* @param mixed ...$args Data values
*
* @return float|string
*/
public static function geometric(...$args)
{
$aArgs = Functions::flattenArray($args);
$aMean = MathTrig\Operations::product($aArgs);
if (is_numeric($aMean) && ($aMean > 0)) {
$aCount = Counts::COUNT($aArgs);
if (Minimum::min($aArgs) > 0) {
return $aMean ** (1 / $aCount);
}
}
return ExcelError::NAN();
}
/**
* HARMEAN.
*
* Returns the harmonic mean of a data set. The harmonic mean is the reciprocal of the
* arithmetic mean of reciprocals.
*
* Excel Function:
* HARMEAN(value1[,value2[, ...]])
*
* @param mixed ...$args Data values
*
* @return float|string
*/
public static function harmonic(...$args)
{
// Loop through arguments
$aArgs = Functions::flattenArray($args);
if (Minimum::min($aArgs) < 0) {
return ExcelError::NAN();
}
$returnValue = 0;
$aCount = 0;
foreach ($aArgs as $arg) {
// Is it a numeric value?
if ((is_numeric($arg)) && (!is_string($arg))) {
if ($arg <= 0) {
return ExcelError::NAN();
}
$returnValue += (1 / $arg);
++$aCount;
}
}
// Return
if ($aCount > 0) {
return 1 / ($returnValue / $aCount);
}
return ExcelError::NA();
}
/**
* TRIMMEAN.
*
* Returns the mean of the interior of a data set. TRIMMEAN calculates the mean
* taken by excluding a percentage of data points from the top and bottom tails
* of a data set.
*
* Excel Function:
* TRIMEAN(value1[,value2[, ...]], $discard)
*
* @param mixed $args Data values
*
* @return float|string
*/
public static function trim(...$args)
{
$aArgs = Functions::flattenArray($args);
// Calculate
$percent = array_pop($aArgs);
if ((is_numeric($percent)) && (!is_string($percent))) {
if (($percent < 0) || ($percent > 1)) {
return ExcelError::NAN();
}
$mArgs = [];
foreach ($aArgs as $arg) {
// Is it a numeric value?
if ((is_numeric($arg)) && (!is_string($arg))) {
$mArgs[] = $arg;
}
}
$discard = floor(Counts::COUNT($mArgs) * $percent / 2);
sort($mArgs);
for ($i = 0; $i < $discard; ++$i) {
array_pop($mArgs);
array_shift($mArgs);
}
return Averages::average($mArgs);
}
return ExcelError::VALUE();
}
}
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