/**
* DOLLAR
*
* This function converts a number to text using currency format, with the decimals rounded to the specified place.
* The format used is $#,##0.00_);($#,##0.00)..
*
* @param float $value The value to format
* @param int $decimals The number of digits to display to the right of the decimal point.
* If decimals is negative, number is rounded to the left of the decimal point.
* If you omit decimals, it is assumed to be 2
* @return string
*/
public static function DOLLAR($value = 0, $decimals = 2)
{
$value = Functions::flattenSingleValue($value);
$decimals = is_null($decimals) ? 0 : Functions::flattenSingleValue($decimals);
// Validate parameters
if (!is_numeric($value) || !is_numeric($decimals)) {
return Functions::NAN();
}
$decimals = floor($decimals);
$mask = '$#,##0';
if ($decimals > 0) {
$mask .= '.' . str_repeat('0', $decimals);
} else {
$round = pow(10, abs($decimals));
if ($value < 0) {
$round = 0 - $round;
}
$value = MathTrig::MROUND($value, $round);
}
return \PHPExcel\Style\NumberFormat::toFormattedString($value, $mask);
}
/**
* DSUM
*
* Adds the numbers in a column of a list or database that match conditions that you specify.
*
* Excel Function:
* DSUM(database,field,criteria)
*
* @access public
* @category Database Functions
* @param mixed[] $database The range of cells that makes up the list or database.
* A database is a list of related data in which rows of related
* information are records, and columns of data are fields. The
* first row of the list contains labels for each column.
* @param string|integer $field Indicates which column is used in the function. Enter the
* column label enclosed between double quotation marks, such as
* "Age" or "Yield," or a number (without quotation marks) that
* represents the position of the column within the list: 1 for
* the first column, 2 for the second column, and so on.
* @param mixed[] $criteria The range of cells that contains the conditions you specify.
* You can use any range for the criteria argument, as long as it
* includes at least one column label and at least one cell below
* the column label in which you specify a condition for the
* column.
* @return float
*
*/
public static function DSUM($database, $field, $criteria)
{
$field = self::fieldExtract($database, $field);
if (is_null($field)) {
return null;
}
// Return
return MathTrig::SUM(self::getFilteredColumn($database, $field, $criteria));
}
/**
* POISSON
*
* Returns the Poisson distribution. A common application of the Poisson distribution
* is predicting the number of events over a specific time, such as the number of
* cars arriving at a toll plaza in 1 minute.
*
* @param float $value
* @param float $mean Mean Value
* @param boolean $cumulative
* @return float
*
*/
public static function POISSON($value, $mean, $cumulative)
{
$value = Functions::flattenSingleValue($value);
$mean = Functions::flattenSingleValue($mean);
if (is_numeric($value) && is_numeric($mean)) {
if ($value < 0 || $mean <= 0) {
return Functions::NAN();
}
if (is_numeric($cumulative) || is_bool($cumulative)) {
if ($cumulative) {
$summer = 0;
for ($i = 0; $i <= floor($value); ++$i) {
$summer += pow($mean, $i) / MathTrig::FACT($i);
}
return exp(0 - $mean) * $summer;
} else {
return exp(0 - $mean) * pow($mean, $value) / MathTrig::FACT($value);
}
}
}
return Functions::VALUE();
}
/**
* BESSELJ
*
* Returns the Bessel function
*
* Excel Function:
* BESSELJ(x,ord)
*
* @access public
* @category Engineering Functions
* @param float $x The value at which to evaluate the function.
* If x is nonnumeric, BESSELJ returns the #VALUE! error value.
* @param integer $ord The order of the Bessel function. If n is not an integer, it is truncated.
* If $ord is nonnumeric, BESSELJ returns the #VALUE! error value.
* If $ord < 0, BESSELJ returns the #NUM! error value.
* @return float
*
*/
public static function BESSELJ($x, $ord)
{
$x = is_null($x) ? 0.0 : Functions::flattenSingleValue($x);
$ord = is_null($ord) ? 0.0 : Functions::flattenSingleValue($ord);
if (is_numeric($x) && is_numeric($ord)) {
$ord = floor($ord);
if ($ord < 0) {
return Functions::NAN();
}
$fResult = 0;
if (abs($x) <= 30) {
$fResult = $fTerm = pow($x / 2, $ord) / MathTrig::FACT($ord);
$ordK = 1;
$fSqrX = $x * $x / -4;
do {
$fTerm *= $fSqrX;
$fTerm /= $ordK * ($ordK + $ord);
$fResult += $fTerm;
} while (abs($fTerm) > 1.0E-12 && ++$ordK < 100);
} else {
$f_PI_DIV_2 = M_PI / 2;
$f_PI_DIV_4 = M_PI / 4;
$fXAbs = abs($x);
$fResult = sqrt(M_2DIVPI / $fXAbs) * cos($fXAbs - $ord * $f_PI_DIV_2 - $f_PI_DIV_4);
if ($ord & 1 && $x < 0) {
$fResult = -$fResult;
}
}
return is_nan($fResult) ? Functions::NAN() : $fResult;
}
return Functions::VALUE();
}