title: Text and second line is not being displayed with plot() and line()
body: <p>None of my text is being displayed when I <code>source</code> my code in RStudio. Also the second line isn't being displayed. I am not sure why this is happening. my vectors <code>alphas</code>, <code>acc_3</code>, and <code>acc_1</code> all have values within them. </p>
  
  <pre><code>alphas = c(0.050, 0.075, 0.100, 0.150, 0.175, 0.200, 0.225, 0.250, 0.275, 0.300)
  acc_1 = c(0.9997631, 0.9999210, 0.9995263, 0.9980261, 1.0000000, 0.9996052, 1.0000000, 0.9999210, 1.0000000, 0.9996052)
  acc_3 = c(0.9526814, 0.9626709, 0.9563617, 0.9447950, 0.9616193, 0.9600421, 0.9521556, 0.9505783, 0.9490011, 0.9463722)  
  plot(alphas, acc_1, type="l", xlab="Alpha", ylab="Acc", col="red")
  lines(alphas, acc_3, col="green")
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/6wUqY.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/6wUqY.png" alt="enter image description here"></a></p>