commitall

vendor/markbaker/matrix/classes/src/Operators/Subtraction.php

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+<?php
+
+namespace Matrix\Operators;
+
+use Matrix\Matrix;
+use Matrix\Exception;
+
+class Subtraction extends Operator
+{
+    /**
+     * Execute the subtraction
+     *
+     * @param mixed $value The matrix or numeric value to subtract from the current base value
+     * @throws Exception If the provided argument is not appropriate for the operation
+     * @return $this The operation object, allowing multiple subtractions to be chained
+     **/
+    public function execute($value): Operator
+    {
+        if (is_array($value)) {
+            $value = new Matrix($value);
+        }
+
+        if (is_object($value) && ($value instanceof Matrix)) {
+            return $this->subtractMatrix($value);
+        } elseif (is_numeric($value)) {
+            return $this->subtractScalar($value);
+        }
+
+        throw new Exception('Invalid argument for subtraction');
+    }
+
+    /**
+     * Execute the subtraction for a scalar
+     *
+     * @param mixed $value The numeric value to subtracted from the current base value
+     * @return $this The operation object, allowing multiple additions to be chained
+     **/
+    protected function subtractScalar($value): Operator
+    {
+        for ($row = 0; $row < $this->rows; ++$row) {
+            for ($column = 0; $column < $this->columns; ++$column) {
+                $this->matrix[$row][$column] -= $value;
+            }
+        }
+
+        return $this;
+    }
+
+    /**
+     * Execute the subtraction for a matrix
+     *
+     * @param Matrix $value The numeric value to subtract from the current base value
+     * @return $this The operation object, allowing multiple subtractions to be chained
+     * @throws Exception If the provided argument is not appropriate for the operation
+     **/
+    protected function subtractMatrix(Matrix $value): Operator
+    {
+        $this->validateMatchingDimensions($value);
+
+        for ($row = 0; $row < $this->rows; ++$row) {
+            for ($column = 0; $column < $this->columns; ++$column) {
+                $this->matrix[$row][$column] -= $value->getValue($row + 1, $column + 1);
+            }
+        }
+
+        return $this;
+    }
+}