Average rating in category

I was able to “create” the following code:

<?php 

$args = array(
    'numberposts' => -1,  // all the posts
    'post_type'   => 'post',
	'category' => $cat,
	'meta_key' => 'ratings_average',
	'meta_value' => null,
	'meta_compare' => '!='
);
$posts = get_posts( $args );

$votes = 0;
$post_count = count($posts);
$rating = 0;
$average = 0;

foreach( $posts as $post ) {
    $single = get_post_meta( $post->ID, 'ratings_average', true );
    $rating += $single;
}

foreach( $posts as $post ) {
    $single = get_post_meta( $post->ID, 'ratings_users', true );
    $votes += $single;
}

	$average = $rating / $post_count;
	echo 'Average rating for the category:<br />';
	echo round($average, 2);
	echo '<br />';
	echo 'Number of votes:<br />';
	echo $votes;

?>

Basically it gathers all average ratings for the posts in certain category, number of total votes for all posts and number of posts which have ratings.

Then to calculate the average rating for the category we devide the sum of all average ratings by the number of posts which have ratings. I think it’s a some kind of a solution since the plugin doesn’t have the ability to rate a category. So my question is:

How to add starts to that rating? Is there something like a shortcode or snippet in the plugin if you input a value and the output is that value converted in stars ??

You can’t just add starts to the ratings, the ratings is associated with a post.
<?php the_ratings( 'div', $post_id ); ?>

I’m not sure if my comment is very clear. I will give an example:

I have average rating for a category 4.5. I just want to show the right number of stars which are corresponding to that value. I don’t want anything else. Just based on numeric value to display right sequence of 5 star images. Something like

<?php the_ratings( ‘4.5’ ); ?> which will output just 5 images
rating_on.png rating_on.png rating_on.png rating_on.png rating_half

Your comments is clear and I get it but what you want is not possible. There is no such function in the ratings. The ratings are all calculated based on post id. You can’t just pass in the number of stars to get it to display.

I see. Anyway thank you for your responses and for your great plugin!