How to print average from comment ratings?

I would also like to be able to print average from comment rating.

It is possible by using nodecomment module. great tutorial: http://drupal.org/node/234681

That link above seems like overkill for this task.. isn't there a shortcut to tally up the average of all the comment ratings by the nodeid, and output the results with something like this?

<?php
$current_rating = votingapi_select_results(array('content_id' => $node->nid, 'function' => 'average'));
print '<div><strong>Rating:</strong>';
print theme('fivestar_static', $current_rating[0]['value'], '5');  //this is for 5 stars, enter 10 (or whatever) instead as appropriate
print '</div>';
?>

prints average node rating, but not average from comments rating

You might be misunderstanding the way Fivestar works. The "average node rating" and the "average from comments" is essentially the same. When you allow a user to rate from a comment, it's the same as if they had clicked on the star rating widget within the node. Generally you probably won't want to have both the direct-rating and the comment-rating enabled on the same node, since they both do the same thing.

EDIT: average prints only the last value of the vote, so when I vote 2, then 4, then 6, I would expect 4, but 6 is displayed

Yes, this is correct because Fivestar (or VotingAPI more accurately) only allows one rating per-user. So if you leave 100 comments all as the same user, only the last rating actually affects the average. If you rate as a different user each time, then the average is taken from each user's last rating.

A related feature request is to not allow users to post (or at least submit a rating through) multiple comments. See #211517: Prevent a user from rating through multiple comments.

czeky: Yes this is the way Fivestar works, as long as each comment is from a different user.

I'm going to close this issue because of previous comments. Feel free to reopen if needed.