title: Adding title to the plot function as a list in R
body: <p>I am using this code for plotting list of variables in a single page:</p>
  
  <pre><code>plot30 &lt;- list(HMn25_30,HMn28_30,HMn29_30,HMn31_30,HMn32_30)
  
  par(mfrow=c(2,3))
  for (i in plot30)  {
    plot(i, type = "o", pch = 16, lty = 2, col = "Black", xlab = "Hour  2007/09/30" , ylab = "Ambient Tempreture")
  }
  </code></pre>
  
  <p>Result of this code:
  <img src="https://i.stack.imgur.com/g6whs.png" alt="enter image description here"></p>
  
  <p>I wanted to add titles such as {Node 25,Node 28,Node 29,Node 31,Node 32} to the plots.</p>
  
  <p>Any suggestion?</p>