title: How do I control space between bars?
body: <p>I am plotting bar chart using the following code: </p>
  
  <pre><code>heights1=c(5,5,4.5,4)
  barplot(heights1, main="Language ", names.arg=c("Hindi R/W", "Speak" , "English 
  R/W","Speak"), ylab=" level ", xlab="Language starting with mostly used",  
  cex.names=0.8, col=c("darkblue","red"))
  </code></pre>
  
  <p>The output comes like this:</p>
  
  <p><img src="https://i.stack.imgur.com/yaEbQ.jpg" alt="enter image description here"></p>
  
  <p>But What I want is that the "Hindi R/w" and "Speak" should combine <strong>without any gap</strong>, and then a space comes and then  "English R/w" and "Speak" should combine. How do I do this?    </p>