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Introduction

gambas provides tools for plotting your data. gambas uses Gnuplot as its plotting backend, so you need to have installed Gnuplot to use the plotting functions. It is advised that you be familiar with basic Gnuplot syntax.

Download Gnuplot here.

Most plotting functions rely on the PlotData object to plot. Here is the definition of PlotData type:

type PlotData struct {
    Df *DataFrame
    Columns []string
    Function string
    Opts []GnuplotOpt
}
  • Df is the DataFrame object you would like to plot.
  • Columns are the columns in Df that you want to plot. Usually, it's a pair of columns [xcol, ycol]. If you want to create a bar graph or a histogram, you can add more columns.
  • Function is an arbitrary function such as sin(x) or an equation of the line of best fit.]
  • Opts are options such as using or with. set is passed in as an argument for other plotting functions.

If you want to plot an arbitrary function, leave Df and Columns as nil. Otherwise, populate Df and Columns, and leave Function as "".