Merging columns in data.frame with "/" symbol
<p>For example, I have the following data.frame with 5 columns:</p>

<pre><code>1 AAA     123             12              33           0.23                           
2 BBB     3123            44              22           0.55                           
3 CCC     221             45              11           0.44                          
</code></pre>

<p>From this data frame I want to create new, which looks like the following:</p>

<pre><code>    1 AAA     123/12         33/0.23                                      
    2 BBB     3123/44        22/0.55                                      
    3 CCC     221/45         11/0.44    
</code></pre>

<p>How can I merge columns (2&amp;3 and 4&amp;5) with the separator "/"?</p>

<p>Of course the variables should be character.       </p>