New Install - nothing happens for plot command

[eli brossell]

I installed octave 2.1.73 and gnuplot 4.2.2-1 today as part of a new i686-pc-cygwin installation.  I've been trying to do some simple plots just to see how things work.  Nothing is happening when I enter the plot command.  The lines below are an example of what I'm entering after starting octave in cygwin.
   
  octave:1> a = [1 2 3];
  octave:2> b = [2 3 4];
  octave:3> plot(a,b)
  octave:4>
   
  I was expecting another window to open as a result of line 3.  Is that wrong?  I've reinstalled gnuplot and octave through the cygwin setup executable a couple of times with various mirrors and both http and ftp.  Any help would be greatly appreciated.

       
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