title: Add text to one column of data.frame
body: <p>I would like to add a text only to one column.</p>
  
  <p>I tried the following(here as an example):</p>
  
  <pre><code>employee &lt;- c('John Doe','Peter Gynn','Jolie Hope')
  addMe &lt;- c('test1','test2','test3')
  salary &lt;- c(21000, 23400, 26800)
  dat &lt;- data.frame(employee, salary, addMe)
  
  dat[] &lt;- lapply(dat$addMe, function(x) paste(' Please delete this col!', x))
  </code></pre>
  
  <p>However, my result frame looks like the following:</p>
  
  <pre><code>     employee                            salary                          addMe
  1    Please delete this col! John Doe    Please delete this col! 21000   Please delete this col! test1
  2    Please delete this col! Peter Gynn  Please delete this col! 23400   Please delete this col! test2
  3    Please delete this col! Jolie Hope  Please delete this col! 26800   Please delete this col! test3
  </code></pre>
  
  <p>However I would like to have as a result:</p>
  
  <pre><code>    employee      salary        addMe
  1   John Doe      21000         Please delete this col! test1
  2   Peter Gynn    23400         Please delete this col! test2
  3   Jolie Hope    26800         Please delete this col! test3    
  </code></pre>
  
  <p>Any suggestions what I am doing wrong?</p>
  
  <p>I appreciate your replies!</p>