diff --git a/src/PhpSpreadsheet/Calculation/Calculation.php b/src/PhpSpreadsheet/Calculation/Calculation.php
index 3bf592c9..1e299f47 100644
--- a/src/PhpSpreadsheet/Calculation/Calculation.php
+++ b/src/PhpSpreadsheet/Calculation/Calculation.php
@@ -2864,13 +2864,13 @@ class Calculation
         $this->debugLog->clearLog();
         $this->cyclicReferenceStack->clear();
 
+        $resetCache = $this->getCalculationCacheEnabled();
         if ($this->spreadsheet !== null && $cellID === null && $pCell === null) {
             $cellID = 'A1';
             $pCell = $this->spreadsheet->getActiveSheet()->getCell($cellID);
         } else {
             //    Disable calculation cacheing because it only applies to cell calculations, not straight formulae
             //    But don't actually flush any cache
-            $resetCache = $this->getCalculationCacheEnabled();
             $this->calculationCacheEnabled = false;
         }
 
@@ -3239,7 +3239,7 @@ class Calculation
     /**
      * @param string $formula
      *
-     * @return string
+     * @return false|string False indicates an error
      */
     private function convertMatrixReferences($formula)
     {
diff --git a/src/PhpSpreadsheet/Calculation/DateTime.php b/src/PhpSpreadsheet/Calculation/DateTime.php
index 796e7959..55740fc1 100644
--- a/src/PhpSpreadsheet/Calculation/DateTime.php
+++ b/src/PhpSpreadsheet/Calculation/DateTime.php
@@ -491,7 +491,7 @@ class DateTime
                 $yearFound = true;
             }
         }
-        if ((count($t1) == 1) && (strpos($t, ':') != false)) {
+        if ((count($t1) == 1) && (strpos($t, ':') !== false)) {
             //    We've been fed a time value without any date
             return 0.0;
         } elseif (count($t1) == 2) {
@@ -892,7 +892,7 @@ class DateTime
      *                                        3                Actual/365
      *                                        4                European 30/360
      *
-     * @return float fraction of the year
+     * @return float|string fraction of the year, or a string containing an error
      */
     public static function YEARFRAC($startDate = 0, $endDate = 0, $method = 0)
     {
diff --git a/src/PhpSpreadsheet/Calculation/Engineering.php b/src/PhpSpreadsheet/Calculation/Engineering.php
index 458d0e86..c3942b2b 100644
--- a/src/PhpSpreadsheet/Calculation/Engineering.php
+++ b/src/PhpSpreadsheet/Calculation/Engineering.php
@@ -785,7 +785,7 @@ class Engineering
      *                                If $ord is nonnumeric, BESSELI returns the #VALUE! error value.
      *                                If $ord < 0, BESSELI returns the #NUM! error value.
      *
-     * @return float
+     * @return float|string Result, or a string containing an error
      */
     public static function BESSELI($x, $ord)
     {
@@ -839,7 +839,7 @@ class Engineering
      *                                If $ord is nonnumeric, BESSELJ returns the #VALUE! error value.
      *                                If $ord < 0, BESSELJ returns the #NUM! error value.
      *
-     * @return float
+     * @return float|string Result, or a string containing an error
      */
     public static function BESSELJ($x, $ord)
     {
@@ -932,7 +932,7 @@ class Engineering
      *                                If $ord is nonnumeric, BESSELK returns the #VALUE! error value.
      *                                If $ord < 0, BESSELK returns the #NUM! error value.
      *
-     * @return float
+     * @return float|string Result, or a string containing an error
      */
     public static function BESSELK($x, $ord)
     {
@@ -1021,7 +1021,7 @@ class Engineering
      *                                If $ord is nonnumeric, BESSELK returns the #VALUE! error value.
      *                                If $ord < 0, BESSELK returns the #NUM! error value.
      *
-     * @return float
+     * @return float|string Result, or a string containing an error
      */
     public static function BESSELY($x, $ord)
     {
diff --git a/src/PhpSpreadsheet/Calculation/Financial.php b/src/PhpSpreadsheet/Calculation/Financial.php
index 90bb36df..412b7a62 100644
--- a/src/PhpSpreadsheet/Calculation/Financial.php
+++ b/src/PhpSpreadsheet/Calculation/Financial.php
@@ -71,7 +71,7 @@ class Financial
      *                                    3                        365
      *                                    4                        European 360
      *
-     * @return int
+     * @return int|string Result, or a string containing an error
      */
     private static function daysPerYear($year, $basis = 0)
     {
@@ -144,7 +144,7 @@ class Financial
      *                                        3                Actual/365
      *                                        4                European 30/360
      *
-     * @return float|string
+     * @return float|string Result, or a string containing an error
      */
     public static function ACCRINT($issue, $firstinterest, $settlement, $rate, $par = 1000, $frequency = 1, $basis = 0)
     {
@@ -197,7 +197,7 @@ class Financial
      *                                        3                Actual/365
      *                                        4                European 30/360
      *
-     * @return float|string
+     * @return float|string Result, or a string containing an error
      */
     public static function ACCRINTM($issue, $settlement, $rate, $par = 1000, $basis = 0)
     {
@@ -1424,7 +1424,7 @@ class Financial
      * @param float $finance_rate The interest rate you pay on the money used in the cash flows
      * @param float $reinvestment_rate The interest rate you receive on the cash flows as you reinvest them
      *
-     * @return float|string
+     * @return float|string Result, or a string containing an error
      */
     public static function MIRR($values, $finance_rate, $reinvestment_rate)
     {
@@ -1466,7 +1466,7 @@ class Financial
      * @param float $effect_rate Effective interest rate
      * @param int $npery Number of compounding payments per year
      *
-     * @return float|string
+     * @return float|string Result, or a string containing an error
      */
     public static function NOMINAL($effect_rate = 0, $npery = 0)
     {
@@ -1493,7 +1493,7 @@ class Financial
      * @param float $fv Future Value
      * @param int $type Payment type: 0 = at the end of each period, 1 = at the beginning of each period
      *
-     * @return float|string
+     * @return float|string Result, or a string containing an error
      */
     public static function NPER($rate = 0, $pmt = 0, $pv = 0, $fv = 0, $type = 0)
     {
@@ -1561,7 +1561,7 @@ class Financial
      * @param float $pv Present Value
      * @param float $fv Future Value
      *
-     * @return float|string
+     * @return float|string Result, or a string containing an error
      */
     public static function PDURATION($rate = 0, $pv = 0, $fv = 0)
     {
@@ -1590,7 +1590,7 @@ class Financial
      * @param float $fv Future Value
      * @param int $type Payment type: 0 = at the end of each period, 1 = at the beginning of each period
      *
-     * @return float
+     * @return float|string Result, or a string containing an error
      */
     public static function PMT($rate = 0, $nper = 0, $pv = 0, $fv = 0, $type = 0)
     {
@@ -1625,7 +1625,7 @@ class Financial
      * @param float $fv Future Value
      * @param int $type Payment type: 0 = at the end of each period, 1 = at the beginning of each period
      *
-     * @return float
+     * @return float|string Result, or a string containing an error
      */
     public static function PPMT($rate, $per, $nper, $pv, $fv = 0, $type = 0)
     {
@@ -1709,7 +1709,7 @@ class Financial
      *                                        3                Actual/365
      *                                        4                European 30/360
      *
-     * @return float
+     * @return float|string Result, or a string containing an error
      */
     public static function PRICEDISC($settlement, $maturity, $discount, $redemption, $basis = 0)
     {
@@ -1755,7 +1755,7 @@ class Financial
      *                                        3                Actual/365
      *                                        4                European 30/360
      *
-     * @return float
+     * @return float|string Result, or a string containing an error
      */
     public static function PRICEMAT($settlement, $maturity, $issue, $rate, $yield, $basis = 0)
     {
@@ -1813,7 +1813,7 @@ class Financial
      * @param float $fv Future Value
      * @param int $type Payment type: 0 = at the end of each period, 1 = at the beginning of each period
      *
-     * @return float
+     * @return float|string Result, or a string containing an error
      */
     public static function PV($rate = 0, $nper = 0, $pmt = 0, $fv = 0, $type = 0)
     {
@@ -1929,7 +1929,7 @@ class Financial
      *                                        3                Actual/365
      *                                        4                European 30/360
      *
-     * @return float
+     * @return float|string Result, or a string containing an error
      */
     public static function RECEIVED($settlement, $maturity, $investment, $discount, $basis = 0)
     {
@@ -1965,7 +1965,7 @@ class Financial
      * @param float $pv Present Value
      * @param float $fv Future Value
      *
-     * @return float|string
+     * @return float|string Result, or a string containing an error
      */
     public static function RRI($nper = 0, $pv = 0, $fv = 0)
     {
@@ -1992,7 +1992,7 @@ class Financial
      * @param mixed $salvage Value at the end of the depreciation
      * @param mixed $life Number of periods over which the asset is depreciated
      *
-     * @return float|string
+     * @return float|string Result, or a string containing an error
      */
     public static function SLN($cost, $salvage, $life)
     {
@@ -2022,7 +2022,7 @@ class Financial
      * @param mixed $life Number of periods over which the asset is depreciated
      * @param mixed $period Period
      *
-     * @return float|string
+     * @return float|string Result, or a string containing an error
      */
     public static function SYD($cost, $salvage, $life, $period)
     {
@@ -2054,7 +2054,7 @@ class Financial
      *                                The maturity date is the date when the Treasury bill expires.
      * @param int $discount The Treasury bill's discount rate
      *
-     * @return float
+     * @return float|string Result, or a string containing an error
      */
     public static function TBILLEQ($settlement, $maturity, $discount)
     {
@@ -2093,7 +2093,7 @@ class Financial
      *                                The maturity date is the date when the Treasury bill expires.
      * @param int $discount The Treasury bill's discount rate
      *
-     * @return float
+     * @return float|string Result, or a string containing an error
      */
     public static function TBILLPRICE($settlement, $maturity, $discount)
     {
@@ -2339,7 +2339,7 @@ class Financial
      *                                        3                Actual/365
      *                                        4                European 30/360
      *
-     * @return float
+     * @return float|string Result, or a string containing an error
      */
     public static function YIELDDISC($settlement, $maturity, $price, $redemption, $basis = 0)
     {
@@ -2390,7 +2390,7 @@ class Financial
      *                                        3                Actual/365
      *                                        4                European 30/360
      *
-     * @return float
+     * @return float|string Result, or a string containing an error
      */
     public static function YIELDMAT($settlement, $maturity, $issue, $rate, $price, $basis = 0)
     {
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig.php b/src/PhpSpreadsheet/Calculation/MathTrig.php
index fc9211b8..a73e14e1 100644
--- a/src/PhpSpreadsheet/Calculation/MathTrig.php
+++ b/src/PhpSpreadsheet/Calculation/MathTrig.php
@@ -59,7 +59,7 @@ class MathTrig
      * @param float $xCoordinate the x-coordinate of the point
      * @param float $yCoordinate the y-coordinate of the point
      *
-     * @return float the inverse tangent of the specified x- and y-coordinates
+     * @return float|string the inverse tangent of the specified x- and y-coordinates, or a string containing an error
      */
     public static function ATAN2($xCoordinate = null, $yCoordinate = null)
     {
@@ -100,7 +100,7 @@ class MathTrig
      * @param float $number the number you want to round
      * @param float $significance the multiple to which you want to round
      *
-     * @return float Rounded Number
+     * @return float|string Rounded Number, or a string containing an error
      */
     public static function CEILING($number, $significance = null)
     {
@@ -139,7 +139,7 @@ class MathTrig
      * @param int $numObjs Number of different objects
      * @param int $numInSet Number of objects in each combination
      *
-     * @return int Number of combinations
+     * @return int|string Number of combinations, or a string containing an error
      */
     public static function COMBIN($numObjs, $numInSet)
     {
@@ -175,7 +175,7 @@ class MathTrig
      *
      * @param float $number Number to round
      *
-     * @return int Rounded Number
+     * @return int|string Rounded Number, or a string containing an error
      */
     public static function EVEN($number)
     {
@@ -209,7 +209,7 @@ class MathTrig
      *
      * @param float $factVal Factorial Value
      *
-     * @return int Factorial
+     * @return int|string Factorial, or a string containing an error
      */
     public static function FACT($factVal)
     {
@@ -248,7 +248,7 @@ class MathTrig
      *
      * @param float $factVal Factorial Value
      *
-     * @return int Double Factorial
+     * @return int|string Double Factorial, or a string containing an error
      */
     public static function FACTDOUBLE($factVal)
     {
@@ -284,7 +284,7 @@ class MathTrig
      * @param float $number Number to round
      * @param float $significance Significance
      *
-     * @return float Rounded Number
+     * @return float|string Rounded Number, or a string containing an error
      */
     public static function FLOOR($number, $significance = null)
     {
@@ -332,7 +332,7 @@ class MathTrig
      *
      * @param mixed ...$args Data values
      *
-     * @return int Greatest Common Divisor
+     * @return int|mixed|string Greatest Common Divisor, or a string containing an error
      */
     public static function GCD(...$args)
     {
@@ -366,7 +366,7 @@ class MathTrig
      *
      * @param float $number Number to cast to an integer
      *
-     * @return int Integer value
+     * @return int|string Integer value, or a string containing an error
      */
     public static function INT($number)
     {
@@ -399,7 +399,7 @@ class MathTrig
      *
      * @param mixed ...$args Data values
      *
-     * @return int Lowest Common Multiplier
+     * @return int|string Lowest Common Multiplier, or a string containing an error
      */
     public static function LCM(...$args)
     {
@@ -451,7 +451,7 @@ class MathTrig
      * @param float $number The positive real number for which you want the logarithm
      * @param float $base The base of the logarithm. If base is omitted, it is assumed to be 10.
      *
-     * @return float
+     * @return float|string The result, or a string containing an error
      */
     public static function logBase($number = null, $base = 10)
     {
@@ -480,7 +480,7 @@ class MathTrig
      *
      * @param array $matrixValues A matrix of values
      *
-     * @return float
+     * @return float|string The result, or a string containing an error
      */
     public static function MDETERM($matrixValues)
     {
@@ -532,7 +532,7 @@ class MathTrig
      *
      * @param array $matrixValues A matrix of values
      *
-     * @return array
+     * @return array|string The result, or a string containing an error
      */
     public static function MINVERSE($matrixValues)
     {
@@ -582,7 +582,7 @@ class MathTrig
      * @param array $matrixData1 A matrix of values
      * @param array $matrixData2 A matrix of values
      *
-     * @return array
+     * @return array|string The result, or a string containing an error
      */
     public static function MMULT($matrixData1, $matrixData2)
     {
@@ -644,7 +644,7 @@ class MathTrig
      * @param int $a Dividend
      * @param int $b Divisor
      *
-     * @return int Remainder
+     * @return int|string Remainder, or a string containing an error
      */
     public static function MOD($a = 1, $b = 1)
     {
@@ -670,7 +670,7 @@ class MathTrig
      * @param float $number Number to round
      * @param int $multiple Multiple to which you want to round $number
      *
-     * @return float Rounded Number
+     * @return float|string Rounded Number, or a string containing an error
      */
     public static function MROUND($number, $multiple)
     {
@@ -700,7 +700,7 @@ class MathTrig
      *
      * @param array of mixed Data Series
      *
-     * @return float
+     * @return float|string The result, or a string containing an error
      */
     public static function MULTINOMIAL(...$args)
     {
@@ -737,7 +737,7 @@ class MathTrig
      *
      * @param float $number Number to round
      *
-     * @return int Rounded Number
+     * @return int|string Rounded Number, or a string containing an error
      */
     public static function ODD($number)
     {
@@ -772,7 +772,7 @@ class MathTrig
      * @param float $x
      * @param float $y
      *
-     * @return float
+     * @return float|string The result, or a string containing an error
      */
     public static function POWER($x = 0, $y = 2)
     {
@@ -931,7 +931,7 @@ class MathTrig
      * @param float $number Number to round
      * @param int $digits Number of digits to which you want to round $number
      *
-     * @return float Rounded Number
+     * @return float|string Rounded Number, or a string containing an error
      */
     public static function ROUNDUP($number, $digits)
     {
@@ -958,7 +958,7 @@ class MathTrig
      * @param float $number Number to round
      * @param int $digits Number of digits to which you want to round $number
      *
-     * @return float Rounded Number
+     * @return float|string Rounded Number, or a string containing an error
      */
     public static function ROUNDDOWN($number, $digits)
     {
@@ -987,7 +987,7 @@ class MathTrig
      * @param float $m Step by which to increase $n for each term in the series
      * @param array of mixed Data Series
      *
-     * @return float
+     * @return float|string The result, or a string containing an error
      */
     public static function SERIESSUM(...$args)
     {
@@ -1026,7 +1026,7 @@ class MathTrig
      *
      * @param float $number Number to round
      *
-     * @return int sign value
+     * @return int|string sign value, or a string containing an error
      */
     public static function SIGN($number)
     {
@@ -1053,7 +1053,7 @@ class MathTrig
      *
      * @param float $number Number
      *
-     * @return float Square Root of Number * Pi
+     * @return float|string Square Root of Number * Pi, or a string containing an error
      */
     public static function SQRTPI($number)
     {
@@ -1307,7 +1307,7 @@ class MathTrig
      *
      * @param mixed ...$args Data values
      *
-     * @return float
+     * @return float|string The result, or a string containing an error
      */
     public static function SUMPRODUCT(...$args)
     {
@@ -1452,7 +1452,7 @@ class MathTrig
      * @param float $value
      * @param int $digits
      *
-     * @return float Truncated value
+     * @return float|string Truncated value, or a string containing an error
      */
     public static function TRUNC($value = 0, $digits = 0)
     {
diff --git a/src/PhpSpreadsheet/Calculation/Statistical.php b/src/PhpSpreadsheet/Calculation/Statistical.php
index 1f9c7665..b1c7fb02 100644
--- a/src/PhpSpreadsheet/Calculation/Statistical.php
+++ b/src/PhpSpreadsheet/Calculation/Statistical.php
@@ -1929,7 +1929,7 @@ class Statistical
      * @param mixed $args Data values
      * @param int $entry Position (ordered from the largest) in the array or range of data to return
      *
-     * @return float
+     * @return float|string The result, or a string containing an error
      */
     public static function LARGE(...$args)
     {
@@ -1970,7 +1970,7 @@ class Statistical
      * @param bool $const a logical value specifying whether to force the intersect to equal 0
      * @param bool $stats a logical value specifying whether to return additional regression statistics
      *
-     * @return array
+     * @return array|int|string The result, or a string containing an error
      */
     public static function LINEST($yValues, $xValues = null, $const = true, $stats = false)
     {
@@ -2029,7 +2029,7 @@ class Statistical
      * @param bool $const a logical value specifying whether to force the intersect to equal 0
      * @param bool $stats a logical value specifying whether to return additional regression statistics
      *
-     * @return array
+     * @return array|int|string The result, or a string containing an error
      */
     public static function LOGEST($yValues, $xValues = null, $const = true, $stats = false)
     {
@@ -2092,7 +2092,7 @@ class Statistical
      * @param float $mean
      * @param float $stdDev
      *
-     * @return float
+     * @return float|string The result, or a string containing an error
      *
      * @todo    Try implementing P J Acklam's refinement algorithm for greater
      *            accuracy if I can get my head round the mathematics
@@ -2125,7 +2125,7 @@ class Statistical
      * @param float $mean
      * @param float $stdDev
      *
-     * @return float
+     * @return float|string The result, or a string containing an error
      */
     public static function LOGNORMDIST($value, $mean, $stdDev)
     {
@@ -2293,7 +2293,7 @@ class Statistical
      *
      * @param mixed ...$args Data values
      *
-     * @return float
+     * @return float|string The result, or a string containing an error
      */
     public static function MEDIAN(...$args)
     {
@@ -2511,7 +2511,7 @@ class Statistical
      *
      * @param mixed ...$args Data values
      *
-     * @return float
+     * @return float|string The result, or a string containing an error
      */
     public static function MODE(...$args)
     {
@@ -2548,7 +2548,7 @@ class Statistical
      * @param float $successes Threshold number of Successes
      * @param float $probability Probability of success on each trial
      *
-     * @return float
+     * @return float|string The result, or a string containing an error
      */
     public static function NEGBINOMDIST($failures, $successes, $probability)
     {
@@ -2586,7 +2586,7 @@ class Statistical
      * @param float $stdDev Standard Deviation
      * @param bool $cumulative
      *
-     * @return float
+     * @return float|string The result, or a string containing an error
      */
     public static function NORMDIST($value, $mean, $stdDev, $cumulative)
     {
@@ -2619,7 +2619,7 @@ class Statistical
      * @param float $mean Mean Value
      * @param float $stdDev Standard Deviation
      *
-     * @return float
+     * @return float|string The result, or a string containing an error
      */
     public static function NORMINV($probability, $mean, $stdDev)
     {
@@ -2650,7 +2650,7 @@ class Statistical
      *
      * @param float $value
      *
-     * @return float
+     * @return float|string The result, or a string containing an error
      */
     public static function NORMSDIST($value)
     {
@@ -2666,7 +2666,7 @@ class Statistical
      *
      * @param float $value
      *
-     * @return float
+     * @return float|string The result, or a string containing an error
      */
     public static function NORMSINV($value)
     {
@@ -2686,7 +2686,7 @@ class Statistical
      * @param mixed $args Data values
      * @param float $entry Percentile value in the range 0..1, inclusive.
      *
-     * @return float
+     * @return float|string The result, or a string containing an error
      */
     public static function PERCENTILE(...$args)
     {
@@ -2784,7 +2784,7 @@ class Statistical
      * @param int $numObjs Number of different objects
      * @param int $numInSet Number of objects in each permutation
      *
-     * @return int|string Number of permutations
+     * @return int|string Number of permutations, or a string containing an error
      */
     public static function PERMUT($numObjs, $numInSet)
     {
@@ -2814,7 +2814,7 @@ class Statistical
      * @param float $mean Mean Value
      * @param bool $cumulative
      *
-     * @return float
+     * @return float|string The result, or a string containing an error
      */
     public static function POISSON($value, $mean, $cumulative)
     {
@@ -2856,7 +2856,7 @@ class Statistical
      * @param mixed $args Data values
      * @param int $entry Quartile value in the range 1..3, inclusive.
      *
-     * @return float
+     * @return float|string The result, or a string containing an error
      */
     public static function QUARTILE(...$args)
     {
@@ -2886,7 +2886,7 @@ class Statistical
      * @param float[] $valueSet An array of, or a reference to, a list of numbers
      * @param int $order Order to sort the values in the value set
      *
-     * @return float
+     * @return float|string The result, or a string containing an error
      */
     public static function RANK($value, $valueSet, $order = 0)
     {
@@ -2921,7 +2921,7 @@ class Statistical
      * @param mixed[] $yValues Data Series Y
      * @param mixed[] $xValues Data Series X
      *
-     * @return float|string
+     * @return float|string The result, or a string containing an error
      */
     public static function RSQ($yValues, $xValues)
     {
@@ -2952,7 +2952,7 @@ class Statistical
      *
      * @param array ...$args Data Series
      *
-     * @return float|string
+     * @return float|string The result, or a string containing an error
      */
     public static function SKEW(...$args)
     {
@@ -2989,7 +2989,7 @@ class Statistical
      * @param mixed[] $yValues Data Series Y
      * @param mixed[] $xValues Data Series X
      *
-     * @return float|string
+     * @return float|string The result, or a string containing an error
      */
     public static function SLOPE($yValues, $xValues)
     {
@@ -3024,7 +3024,7 @@ class Statistical
      * @param mixed $args Data values
      * @param int $entry Position (ordered from the smallest) in the array or range of data to return
      *
-     * @return float
+     * @return float|string The result, or a string containing an error
      */
     public static function SMALL(...$args)
     {
@@ -3063,7 +3063,7 @@ class Statistical
      * @param float $mean Mean Value
      * @param float $stdDev Standard Deviation
      *
-     * @return float Standardized value
+     * @return float|string Standardized value, or a string containing an error
      */
     public static function STANDARDIZE($value, $mean, $stdDev)
     {
@@ -3095,7 +3095,7 @@ class Statistical
      *
      * @param mixed ...$args Data values
      *
-     * @return float|string
+     * @return float|string The result, or a string containing an error
      */
     public static function STDEV(...$args)
     {
@@ -3321,7 +3321,7 @@ class Statistical
      * @param float $degrees degrees of freedom
      * @param float $tails number of tails (1 or 2)
      *
-     * @return float
+     * @return float|string The result, or a string containing an error
      */
     public static function TDIST($value, $degrees, $tails)
     {
@@ -3385,7 +3385,7 @@ class Statistical
      * @param float $probability Probability for the function
      * @param float $degrees degrees of freedom
      *
-     * @return float
+     * @return float|string The result, or a string containing an error
      */
     public static function TINV($probability, $degrees)
     {