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<?php
namespace PhpOffice\PhpSpreadsheet\Calculation\Engineering;
use PhpOffice\PhpSpreadsheet\Calculation\Exception;
use PhpOffice\PhpSpreadsheet\Calculation\Functions;
class Compare
{
/**
* DELTA.
*
* Excel Function:
* DELTA(a[,b])
*
* Tests whether two values are equal. Returns 1 if number1 = number2; returns 0 otherwise.
* Use this function to filter a set of values. For example, by summing several DELTA
* functions you calculate the count of equal pairs. This function is also known as the
* Kronecker Delta function.
*
* @param float $a the first number
* @param float $b The second number. If omitted, b is assumed to be zero.
*
* @return int|string (string in the event of an error)
*/
public static function DELTA($a, $b = 0)
{
$a = Functions::flattenSingleValue($a);
$b = Functions::flattenSingleValue($b);
try {
$a = EngineeringValidations::validateFloat($a);
$b = EngineeringValidations::validateFloat($b);
} catch (Exception $e) {
return $e->getMessage();
}
return (int) ($a == $b);
}
/**
* GESTEP.
*
* Excel Function:
* GESTEP(number[,step])
*
* Returns 1 if number >= step; returns 0 (zero) otherwise
* Use this function to filter a set of values. For example, by summing several GESTEP
* functions you calculate the count of values that exceed a threshold.
*
* @param float $number the value to test against step
* @param float $step The threshold value. If you omit a value for step, GESTEP uses zero.
*
* @return int|string (string in the event of an error)
*/
public static function GESTEP($number, $step = 0)
{
$number = Functions::flattenSingleValue($number);
$step = Functions::flattenSingleValue($step);
try {
$number = EngineeringValidations::validateFloat($number);
$step = EngineeringValidations::validateFloat($step);
} catch (Exception $e) {
return $e->getMessage();
}
return (int) ($number >= $step);
}
}