title: variable for title in R graph
body: <p>When I try to give the title name as a function argument for Z and for legend, it is not working.. I also tried by just giving z. Please advise..</p>
  
  <pre><code>drawGraph &lt;- function(x, y, z) {
      g_range &lt;- range(0,x)
      plot(x, type="o", col="blue", ylim=g_range,axes=FALSE, ann=FALSE)
      box()
      axis(1, at=1:19, lab=FALSE)
      text(1:19, par("usr")[3] - 2, srt=45, adj=1.2, labels=y, xpd=T, cex=0.3)
      axis(2, las=1, at=500*0:g_range[2])
      main_title&lt;-as.character(z)
      title(main=main_title, col.main="red", font.main=4)
      title(xlab="Build", col.lab=rgb(0,0.5,0))
      title(ylab="MS", col.lab=rgb(0,0.5,0))
      legend("topright", g_range[2], c("z"), cex=0.8, col=c("blue"), pch=21, lty=1);
  }
  drawGraph(AET, lab, AveElapsedTime)
  </code></pre>