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Creating a PGplotter tool

A PGplotter tool is created from the Glish prompt as follows:

include 'pgplotter.g'
pg:=pgplotter()

The specific PGplotter tool, pg, is now ready to accept plotting instructions. The following complete example shows how to make a simple line plot:

include 'pgplotter.g'
#
x := 1:100
y := sin(x/5)
pg:=pgplotter()
pg.plotxy1(x,y,'X','Y','Sample')
#
y := cos(x/3)
pg.plotxy1(x,y)              # Adds to plot with new colour