title: adjust aspect ratio of plot in R
body: <p>I would like to have several subplots in a row in a plot. However the apprearance of each subplot is narrow. How can I adjust the aspect ratio so that each subplot will become wider? Thanks!<img src="https://i.stack.imgur.com/THlml.png" alt="alt text"></p>
  
  <pre><code>par(mfrow=c(1,3))
  for (i in 1:3){
          dest=density(out[,i])
          hist(out[,i], xlim=range(dest$x),xlab=paste("x[",i,"]"),ylab="density", main="", prob=TRUE)
          lines(dest,col="red")
  }
  </code></pre>