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Add exponent by scalar on matrix function

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Original file line number	Diff line number	Diff line change
`@@ -133,6 +133,28 @@ public function multiplyByScalar($value): self`
`133`	`133`	`return new static($result);`
`134`	`134`	`}`
`135`	`135`
	`136`	`+ /**`
	`137`	`+ * Performs exponential expression by scalar value`
	`138`	`+ *`
	`139`	`+ * @param int\|float $value Exponent`
	`140`	`+ *`
	`141`	`+ * @return $this`
	`142`	`+ */`
	`143`	`+ public function powByScalar($value): self`
	`144`	`+ {`
	`145`	`+ if (!is_numeric($value)) {`
	`146`	`+ throw new \InvalidArgumentException("Exponent accepts only numeric values");`
	`147`	`+ }`
	`148`	`+ $result = [];`
	`149`	`+ for ($i = 0; $i < $this->rows; ++$i) {`
	`150`	`+ for ($j = 0; $j < $this->columns; ++$j) {`
	`151`	`+ $result[$i][$j] = $this->matrix[$i][$j] ** $value;`
	`152`	`+ }`
	`153`	`+ }`
	`154`	`+`
	`155`	`+ return new static($result);`
	`156`	`+ }`
	`157`	`+`
`136`	`158`	`/**`
`137`	`159`	`* Performs addition of two matrices`
`138`	`160`	`*`
`@@ -239,6 +261,11 @@ public static function __doOperation(int $opCode, $left, $right): Matrix`
`239`	`261`	`return $left->divideByScalar($right);`
`240`	`262`	`}`
`241`	`263`	`break;`
	`264`	`+ case OpCode::POW:`
	`265`	`+ if ($isLeftMatrix && $isRightNumeric) {`
	`266`	`+ return $left->powByScalar($right);`
	`267`	`+ }`
	`268`	`+ break;`
`242`	`269`	`}`
`243`	`270`
`244`	`271`	`throw new \LogicException('Unsupported ' . OpCode::name($opCode). ' operation or invalid arguments');`

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