Gnuplot is a free, command-driven, interactive, function and data plotting program.
Lets create a graph using Gnuplot based on data we got in a table. You can download the table I'm using here.
qkim@lotta:~> gnuplot gnuplot> plot "gnuplot_table.txt" using 1:2 title 'data1' w linespoints, \ "gnuplot_table.txt" using 1:3 title 'data2' w linespoints
Gnuplot does not need so complicated when creating simple graphs.
Screenshot of Gnuplot
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