How can i get the Parameters from Behat.yml to a php file?

I have a Behat.yml

  default :
     context :
       parameters :
            user: xyz
            password : abc

Also i have a file called FeatureContext.php which retrieves the values from behat.yml through

   public function iExample($user, $password)
    {
       $userName=$this->getParameter($user);
    }

But it throws an error like

   "Call to undefined method FeatureContext::getParameter()"

Am i missing something ? .. i have also added autoload.php in FeatureContext.php through

   require_once __DIR__.'/../../vendor/autoload.php';

Please let know , if you have any idea why it is happening ?