multiple lines on one screen

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Define 4 variables (x=1:.01,4;       y=sin(x);       z=cos(x)...etc)
2. Try to plot all four variables at once (plot(x,y,x,z))

What is the expected output? What do you see instead?
A plot with two curves, (sin and cos) is expected. Error instead , "only simple 
plots supported"


What version of the product are you using? On what operating system?
1.91 on ice cream sandwich.


Please provide any additional information below.
Thank you for your awesome work. I am very excited about this app.

Original issue reported on code.google.com by mymath.t...@gmail.com on 29 Feb 2012 at 6:36