title: How to plot an exponential distribution
body: <p>I want to plot an exponential distribution, something like this for example: <a href="https://i.stack.imgur.com/5tnbo.png" rel="noreferrer"><img src="https://i.stack.imgur.com/5tnbo.png" alt="enter image description here"></a></p>
  
  <p>But I only know how to simulate a data frame that follow a exponential distribution and plot it. </p>
  
  <pre><code>data =  data.frame(x=rexp(n = 100000, rate = .65))
  m &lt;- ggplot(data, aes(x=data$x))
  m + geom_density()
  </code></pre>
  
  <p>From which I get: 
  <a href="https://i.stack.imgur.com/bnP0O.png" rel="noreferrer"><img src="https://i.stack.imgur.com/bnP0O.png" alt="enter image description here"></a></p>
  
  <p>How can I plot the true exponential distribution instead of a sampled version of the distribution? </p>