title: Is there a way to control the default pixel sizes of images exported from RStudio?
body: <p>I am producing many images with R graphics.</p>
  
  <p>I am using RStudio.</p>
  
  <p>RStudio has "Save plot as Image" and "Save plot as PDF" options.</p>
  
  <p>However, the default size of the plot window seems to be controlled by the interface.  If I resize the windows and panes, the plot resizes, and sometimes loses important data.</p>
  
  <p>Is there some environment variable that controls the default number of pixels in the plots?</p>