condtional for post title in sidebar

Check out:
https://codex.www.ads-software.com/Function_Reference/in_category

Thanks, I’ve been looking at that all day. But I’m unable to make it work.

<?php if ( is_category('36,46) || is_archive() ) {
	the_title();
}  ?>

I think I need more code, I don’t know how to tell it that it’s for the current post only, and I wouldn’t know how to add that to the equation anyway, I’d spend hours with trial and error.

It’s all good, I was going at it the hard way. Instead I removed:

<h2 class="posttitle"><a href="<?php the_permalink() ?>" rel="bookmark" title="<?php _e( 'Permanent Link to', 'buddypress' ) ?> <?php the_title_attribute(); ?>"><?php the_title(); ?></a></h2>

From the custom post template I’m using, then I added:

<div class="post" id="post-<?php the_ID(); ?>">
<h2 class="posttitle"><a href="<?php the_permalink() ?>" rel="bookmark" title="<?php _e( 'Permanent Link to', 'buddypress' ) ?> <?php the_title_attribute(); ?>"><?php the_title(); ?></a></h2>
</div>

to a php widget that I can add conditionals to. Works perfectly! Hopefully it won’t matter that I removed that title code, these are private posts, so search-engine-friendly is not a factor.
Thanks for the link just the same.