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<?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) { 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) { $originalColumnCount = count($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; } }