php-armadillo/stubs/internal/SparseVector.php

<?php

namespace Arma\Internal;

use Arma\SpMapVal;

interface SparseVector extends Sparse, Vector
{
    /// Subview

    /**
     * {@inheritdoc}
     *
     * @param int $idx
     * @return SpMapVal
     */
    function __invoke($idx);

    /**
     * {@inheritdoc}
     *
     * @param int $idx
     * @return SpMapVal
     */
    function at($idx);
}