src/Maths/Algebra/Matrix.php
public function seekX($index)
    {
        if ($index>0 && $index<=$this->countX()) {
            $this->x = $index;
        } else {
            throw new OutOfRangeException(
                "Index '{$index}' for scope 'x' is out of range of available data"
            );
        }
        return $this;
    }
public function seekX($index)
    {
        if ($index>0 && $index<=$this->countX()) {
            $this->x = $index;
        } else {
            throw new OutOfRangeException(
                "Index '{$index}' for scope 'x' is out of range of available data"
            );
        }
        return $this;
    }
Seek to index for `x` (line)

@param   int  $index
@return  $this
@throws  OutOfRangeException if the index is out of range