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maxima-draw2d-plus is a collection of additional functions for the draw2d package of the maxima CAS, a free symbolic mathematics package, see:

http://maxima.sourceforge.net/

http://riotorto.users.sourceforge.net/gnuplot/index.html

To load the package, put the file vector.mac in a location where maxima can find it and type on the maxima prompt:

(%i01) batch("vector.mac");

The package draw2d is automatically loaded when you load vector.mac. You can now use the new command Vectorplot.

The syntax is: Vectorplot([fx(x,y),fy(x,y)],[xmin,xmax],[ymin,ymax],[optional-arguments])

(%i02) Vectorplot([y,-x],[-2,2],[-3,3]);