title: Set width of ggplot in R
body: <p>I have a ggplot</p>
  
  <pre><code>   gg&lt;-ggplot(bigDF, aes(x=time, y=price)) + geom_line() + 
       geom_point(aes(shape = as.factor(ShapeType),
                      size = as.factor(PointSize), 
                     colour = PointColor)) +
      scale_color_manual(values = levels(as.factor(bigDF$PointColor)) ) +
      ggtitle("trades") +
      scale_shape_identity(guide="none") 
  </code></pre>
  
  <p>How do I set it's width and height?
   I am using shiny and on my UI.r I have</p>
  
  <pre><code> tabsetPanel(tabPanel("Main",uiOutput("plots", height = 500, width = 800)) )#tabsetPanel  
  </code></pre>
  
  <p>but I get an error:</p>
  
  <pre><code>Error in uiOutput("plots", height = 500, width = 800) : 
    unused arguments (height = 500, width = 800)
  </code></pre>
  
  <p>Thank you.</p>