Proyectos de Subversion Moodle

<?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;

    }

}