Wordpress - display certain categories on homepage - wordpress

Question

I have been trying to alter my current code, but it makes no sense to me (it doesn't do what I was told it does). All I want to do is only display posts with category 13 on my homepage and I want to be able to add multiple categories to a post.
Post 1 (Category 13 and 1) = displayed on homepage
Post 2 (Category 13 and 4 and 5) = displayed on homepage
Post 3 (Category 6 and 1) = not visible on homepage
Post 4 (Category 2) = not visible on homepage
This is my current code to only show category 13 on my homepage, if another category is added to the post it won't be displayed at all.
<?php get_header(); ?>
<div id="primary">
<div id="content" role="main">
<?php
if (is_home()) {
query_posts("cat=-6,-4,-1,-11");
}
?>
<?php if ( have_posts() ) : ?>
<?php twentyeleven_content_nav( 'nav-above' ); ?>
<?php /* Start the Loop */ ?>
<?php while ( have_posts() ) : the_post(); ?>
<?php get_template_part( 'content', get_post_format() ); ?>
<?php endwhile; ?>
<?php
$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
$args = array(
'cat' => 13,
'posts_per_page' => 5,
'paged' => $paged);
query_posts($args);
?>
<?php twentyeleven_content_nav( 'nav-below' ); ?>
<?php else : ?>
<article id="post-0" class="post no-results not-found">
<header class="entry-header">
<h1 class="entry-title"><?php _e( 'Geen berichten beschikbaar', 'twentyeleven' ); ?></h1>
</header><!-- .entry-header -->
<div class="entry-content">
<p><?php _e( 'Helaas, er zijn nog geen gearchiveerde berichten in deze categorie. ', 'twentyeleven' ); ?></p>
<?php get_search_form(); ?>
</div><!-- .entry-content -->
</article><!-- #post-0 -->
<?php endif; ?>

Answer 1

You're looking way too hard at this code. You don't need to exclude anything, you just need to include cat 13, which will include everything that is in cat 13; even if it is in other categories as well. Just run a regular WP_Query() like so:
<?php get_header(); ?>
<div id="primary">
<div id="content" role="main">
<?php
if (is_home()) {
// The Query
$the_query = new WP_Query("cat=13, paged=".get_query_var('paged'));
}
?>
<?php if ( have_posts() ) : ?>
<?php twentyeleven_content_nav( 'nav-above' ); ?>
<?php /* Start the Loop */ ?>
<?php while ( $the_query->have_posts() ) : $the_query->the_post(); ?>
<?php get_template_part( 'content', get_post_format() ); ?>
<?php endwhile; ?>
<?php twentyeleven_content_nav( 'nav-below' ); ?>
<?php else : ?>
<article id="post-0" class="post no-results not-found">
<header class="entry-header">
<h1 class="entry-title"><?php _e( 'Geen berichten beschikbaar', 'twentyeleven' ); ?></h1>
</header><!-- .entry-header -->
<div class="entry-content">
<p><?php _e( 'Helaas, er zijn nog geen gearchiveerde berichten in deze categorie. ', 'twentyeleven' ); ?></p>
<?php get_search_form(); ?>
</div><!-- .entry-content -->
</article><!-- #post-0 -->
<?php endif; ?>
(had to add a few charachters or I could not edit, sorry :P)

Answer 2

Try this...
<?php
$temp = $wp_query;
$wp_query = null;
$wp_query = new WP_Query();
$wp_query->query('showposts=6&cat=13'.'&paged='.$paged);
?>
<?php while ($wp_query->have_posts()) : $wp_query->the_post(); ?>
Your stuff goes here...
<?php endwhile; ?>
<?php
$wp_query = null;
$wp_query = $temp; // Reset
?>

Answer 3

Try this code
<?php
global $post;
if (is_home()) {
$args = array( 'numberposts' => 5, 'category' => 13 );
$myposts = get_posts( $args );
foreach( $myposts as $post ) : setup_postdata($post); ?>
<h2><?php the_title(); ?></h2>
<div class="entry-content">
<?php the_content( 'Continue reading <span class="meta-nav">»</span>); ?>
</div>
<?php endforeach;
}
?>
This will display the title and content. If you want additional information like date, author, category, tag etc, you may have to use other template tags. Also if you want to style these differently, then you have to use appropriate CSS.