From 75160b12821f7f4299cce7f0b69c83c1502ae071 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Anton=20Luka=20=C5=A0ijanec?= <anton@sijanec.eu>
Date: Mon, 27 May 2024 13:08:29 +0200
Subject: 2024-02-19 upstream

---
 .../matrix/classes/src/Operators/DirectSum.php     | 64 ++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 vendor/markbaker/matrix/classes/src/Operators/DirectSum.php

(limited to 'vendor/markbaker/matrix/classes/src/Operators/DirectSum.php')

diff --git a/vendor/markbaker/matrix/classes/src/Operators/DirectSum.php b/vendor/markbaker/matrix/classes/src/Operators/DirectSum.php
new file mode 100644
index 0000000..e729a43
--- /dev/null
+++ b/vendor/markbaker/matrix/classes/src/Operators/DirectSum.php
@@ -0,0 +1,64 @@
+<?php
+
+namespace Matrix\Operators;
+
+use Matrix\Matrix;
+use Matrix\Exception;
+
+class DirectSum extends Operator
+{
+    /**
+     * Execute the addition
+     *
+     * @param mixed $value The matrix or numeric value to add to the current base value
+     * @return $this The operation object, allowing multiple additions to be chained
+     * @throws Exception If the provided argument is not appropriate for the operation
+     */
+    public function execute($value): Operator
+    {
+        if (is_array($value)) {
+            $value = new Matrix($value);
+        }
+
+        if ($value instanceof Matrix) {
+            return $this->directSumMatrix($value);
+        }
+
+        throw new Exception('Invalid argument for addition');
+    }
+
+    /**
+     * Execute the direct sum for a matrix
+     *
+     * @param Matrix $value The numeric value to concatenate/direct sum with the current base value
+     * @return $this The operation object, allowing multiple additions to be chained
+     **/
+    private function directSumMatrix($value): Operator
+    {
+        $originalColumnCount = count($this->matrix[0]);
+        $originalRowCount = count($this->matrix);
+        $valColumnCount = $value->columns;
+        $valRowCount = $value->rows;
+        $value = $value->toArray();
+
+        for ($row = 0; $row < $this->rows; ++$row) {
+            $this->matrix[$row] = array_merge($this->matrix[$row], array_fill(0, $valColumnCount, 0));
+        }
+
+        $this->matrix = array_merge(
+            $this->matrix,
+            array_fill(0, $valRowCount, array_fill(0, $originalColumnCount, 0))
+        );
+
+        for ($row = $originalRowCount; $row < $originalRowCount + $valRowCount; ++$row) {
+            array_splice(
+                $this->matrix[$row],
+                $originalColumnCount,
+                $valColumnCount,
+                $value[$row - $originalRowCount]
+            );
+        }
+
+        return $this;
+    }
+}
-- 
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