dding polinomial approximation 2d

Matrix.php

@@ -23,6 +23,11 @@ class Matrix
         return $this->M;
     }
     
+    public function set($i,$j,$v){
+        $M[$i][$j] = $v;
+    }
+    
+    
     public function getColumnPackedCopy(){
         $rows = sizeof($this->M);
         $cols = sizeof($this->M[0]);
@@ -82,6 +87,9 @@ class Matrix
     }
 
     public function plus($B) {
+        if ($B instanceof Matrix){
+            $B = $B->get();
+        }
         $R = $this->M;
         $rows = sizeof($this->M);
         $cols = sizeof($this->M[0]);
@@ -95,6 +103,21 @@ class Matrix
         }
         return new Matrix ($R, $this->Tol);
     }
+    public function plusEquals($B){
+        if ($B instanceof Matrix){
+            $B = $B->get();
+        }
+        $rows = sizeof($this->M);
+        $cols = sizeof($this->M[0]);
+        if (($rows != sizeof($B[0])) || ($cols != sizeof($B[0]))){
+            throw new Exception('Dimensions mismatch.');
+        }
+        for ($i = 0; $i < $rows; $i ++) {
+            for ($j = 0; $j < $cols; $j ++) {
+                $this->M[$i][$j] += $B[$i][$j];
+            }
+        }
+    }
     
     
     public function print($debugFile = null, $decimals = 6)