Ruby version of matplotlib

Hello fabulous Ruby people!

Would you say the Ruby GNUplot library is the closest thing we have to
Python’s matplotlib? Do you know of a library that provides an interface
for quickly creating line plots in MS Windows? I will be building simple
commandline scripts and little Windows gui programs to generate the
plots from.

Here you will find a description of matplotlib: http://matplotlib.org/

Thank you and have a wonderful day,

Jason