title: R plotting why not starting from (0,0)?
body: <p>I'm new to R programming and graphics. I'm trying to draw a graph but the (0,0) point is not at the right place. Can someone please tell me how to fix it? Thanks.
  <img src="https://i.stack.imgur.com/ogRWI.png" alt="enter image description here"></p>
  
  <p>Here's my code:</p>
  
  <pre><code>layout(matrix(c(0,0,0,0,0,
                  0,1,3,2,0,
                  0,0,0,0,0), nc = 5, byrow = TRUE),
         widths = c(lcm(2), 1, lcm(2), 1, lcm(2)),
         heights = c(lcm(2), 1, lcm(2)))
  layout.show(3)
  box("outer", lty = "dotted")
  plot.new()
  plot.window(xlim=c(-200,0),ylim=c(0,21))
  box()
  axis(1)
  axis(4)
  rect(-113,0,0,1,col='cyan')
  </code></pre>