title: Paste multiple strings onto one string
body: <p>I have a vector
  <code>Names&lt;-c("A", "B", "C")</code></p>
  
  <p>And I would ultimately like something like this<br>
  <code>c("A_Mean", "A_Median", "A_InGroupVar", "B_Mean", "B_Median", "B_InGroupVar", "C_Mean", "C_Median", "C_InGroupVar")</code></p>
  
  <p>I have tried the paste function
  <code>c(paste(Names, "_Mean"), paste(Names, "_Median"), paste(Names, "_InGroupvar"))</code></p>
  
  <p>But I need the vector to be ordered by Name. I know I could easily do this in a loop but I am looking for a more elegant solution.  </p>