I'm ignoring SUMIF() and SUMIFS() for the moment; so this should complete all the applicable Math/Trig functions;so the subset SERIESSUM() function and RANDBETWEEN() should complete Math/Trig (#2586)

src/PhpSpreadsheet/Calculation/MathTrig.php

@@ -597,7 +597,7 @@ class MathTrig
      * @param int $min Minimal value
      * @param int $max Maximal value
      *
-     * @return float|int|string Random number
+     * @return array|float|int|string Random number
      */
     public static function RAND($min = 0, $max = 0)
     {
@@ -679,7 +679,7 @@ class MathTrig
      * @param mixed $m Step
      * @param mixed[] $args An array of coefficients for the Data Series
      *
-     * @return float|string The result, or a string containing an error
+     * @return array|float|string The result, or a string containing an error
      */
     public static function SERIESSUM($x, $n, $m, ...$args)
     {

src/PhpSpreadsheet/Calculation/MathTrig/Random.php

@@ -2,11 +2,14 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
 
+use PhpOffice\PhpSpreadsheet\Calculation\ArrayEnabled;
 use PhpOffice\PhpSpreadsheet\Calculation\Exception;
 use PhpOffice\PhpSpreadsheet\Calculation\Functions;
 
 class Random
 {
+    use ArrayEnabled;
+
     /**
      * RAND.
      *
@@ -21,12 +24,20 @@ class Random
      * RANDBETWEEN.
      *
      * @param mixed $min Minimal value
+     *                      Or can be an array of values
      * @param mixed $max Maximal value
+     *                      Or can be an array of values
      *
-     * @return float|int|string Random number
+     * @return array|float|int|string Random number
+     *         If an array of numbers is passed as an argument, then the returned result will also be an array
+     *            with the same dimensions
      */
     public static function randBetween($min, $max)
     {
+        if (is_array($min) || is_array($max)) {
+            return self::evaluateArrayArguments([self::class, __FUNCTION__], $min, $max);
+        }
+
         try {
             $min = (int) Helpers::validateNumericNullBool($min);
             $max = (int) Helpers::validateNumericNullBool($max);

src/PhpSpreadsheet/Calculation/MathTrig/SeriesSum.php

@@ -2,11 +2,14 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
 
+use PhpOffice\PhpSpreadsheet\Calculation\ArrayEnabled;
 use PhpOffice\PhpSpreadsheet\Calculation\Exception;
 use PhpOffice\PhpSpreadsheet\Calculation\Functions;
 
 class SeriesSum
 {
+    use ArrayEnabled;
+
     /**
      * SERIESSUM.
      *
@@ -17,10 +20,14 @@ class SeriesSum
      * @param mixed $m Step
      * @param mixed[] $args An array of coefficients for the Data Series
      *
-     * @return float|string The result, or a string containing an error
+     * @return array|float|string The result, or a string containing an error
      */
     public static function evaluate($x, $n, $m, ...$args)
     {
+        if (is_array($x) || is_array($n) || is_array($m)) {
+            return self::evaluateArrayArgumentsSubset([self::class, __FUNCTION__], 3, $x, $n, $m, ...$args);
+        }
+
         try {
             $x = Helpers::validateNumericNullSubstitution($x, 0);
             $n = Helpers::validateNumericNullSubstitution($n, 0);

src/PhpSpreadsheet/Calculation/MathTrig/Subtotal.php

@@ -52,17 +52,17 @@ class Subtotal
 
     /** @var callable[] */
     private const CALL_FUNCTIONS = [
-        1 => [Statistical\Averages::class, 'average'],
+        1 => [Statistical\Averages::class, 'average'], // 1 and 101
-        [Statistical\Counts::class, 'COUNT'], // 2
+        [Statistical\Counts::class, 'COUNT'], // 2 and 102
-        [Statistical\Counts::class, 'COUNTA'], // 3
+        [Statistical\Counts::class, 'COUNTA'], // 3 and 103
-        [Statistical\Maximum::class, 'max'], // 4
+        [Statistical\Maximum::class, 'max'], // 4 and 104
-        [Statistical\Minimum::class, 'min'], // 5
+        [Statistical\Minimum::class, 'min'], // 5 and 105
-        [Operations::class, 'product'], // 6
+        [Operations::class, 'product'], // 6 and 106
-        [Statistical\StandardDeviations::class, 'STDEV'], // 7
+        [Statistical\StandardDeviations::class, 'STDEV'], // 7 and 107
-        [Statistical\StandardDeviations::class, 'STDEVP'], // 8
+        [Statistical\StandardDeviations::class, 'STDEVP'], // 8 and 108
-        [Sum::class, 'sumIgnoringStrings'], // 9
+        [Sum::class, 'sumIgnoringStrings'], // 9 and 109
-        [Statistical\Variances::class, 'VAR'], // 10
+        [Statistical\Variances::class, 'VAR'], // 10 and 110
-        [Statistical\Variances::class, 'VARP'], // 11
+        [Statistical\Variances::class, 'VARP'], // 111 and 111
     ];
 
     /**

tests/PhpSpreadsheetTests/Calculation/Functions/MathTrig/RandBetweenTest.php

@@ -2,6 +2,8 @@
 
 namespace PhpOffice\PhpSpreadsheetTests\Calculation\Functions\MathTrig;
 
+use PhpOffice\PhpSpreadsheet\Calculation\Calculation;
+
 class RandBetweenTest extends AllSetupTeardown
 {
     /**
@@ -43,4 +45,30 @@ class RandBetweenTest extends AllSetupTeardown
     {
         return require 'tests/data/Calculation/MathTrig/RANDBETWEEN.php';
     }
+
+    /**
+     * @dataProvider providerRandBetweenArray
+     */
+    public function testRandBetweenArray(
+        int $expectedRows,
+        int $expectedColumns,
+        string $argument1,
+        string $argument2
+    ): void {
+        $calculation = Calculation::getInstance();
+
+        $formula = "=RandBetween({$argument1}, {$argument2})";
+        $result = $calculation->_calculateFormulaValue($formula);
+        self::assertIsArray($result);
+        self::assertCount($expectedRows, $result);
+        self::assertIsArray($result[0]);
+        self::assertCount($expectedColumns, $result[0]);
+    }
+
+    public function providerRandBetweenArray(): array
+    {
+        return [
+            'row/column vectors' => [2, 2, '{1, 10}', '{10; 100}'],
+        ];
+    }
 }

tests/PhpSpreadsheetTests/Calculation/Functions/MathTrig/SeriesSumTest.php

@@ -2,6 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheetTests\Calculation\Functions\MathTrig;
 
+use PhpOffice\PhpSpreadsheet\Calculation\Calculation;
 use PhpOffice\PhpSpreadsheet\Calculation\Functions;
 
 class SeriesSumTest extends AllSetupTeardown
@@ -43,4 +44,25 @@ class SeriesSumTest extends AllSetupTeardown
     {
         return require 'tests/data/Calculation/MathTrig/SERIESSUM.php';
     }
+
+    /**
+     * @dataProvider providerSeriesSumArray
+     */
+    public function testSeriesSumArray(array $expectedResult, string $x, string $n, string $m, string $values): void
+    {
+        $calculation = Calculation::getInstance();
+
+        $formula = "=SERIESSUM({$x}, {$n}, {$m}, {$values})";
+        $result = $calculation->_calculateFormulaValue($formula);
+        self::assertEqualsWithDelta($expectedResult, $result, 1.0e-14);
+    }
+
+    public function providerSeriesSumArray(): array
+    {
+        return [
+            'row vector #1' => [[[3780, 756]], '5', '{1, 0}', '1', '{1, 1, 0, 1, 1}'],
+            'column vector #1' => [[[54], [3780]], '{2; 5}', '1', '1', '{1, 1, 0, 1, 1}'],
+            'matrix #1' => [[[54, 27], [3780, 756]], '{2; 5}', '{1, 0}', '1', '{1, 1, 0, 1, 1}'],
+        ];
+    }
 }