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Parameters.

The right part of the geometric view is the parameter area, just below the current mouse coordinates (x:,y:, note that if the coordinates do not appear, you can resynchronize the mouse with the coordinate system by clicking in the parameter area). Each parameter has a range value drawn as an horizontal segment and a current value drawn as a vertical segment. Click on the horizontal segment to change the parameter value (you can also drag to move the current value). Parameters are defined in the command line using the element command (in the Geo menu). For example :
a:=element(-2..2,1)
b:=element(-3..3)
c:=element(-1..1)
plotfunc(a*x^2+b*x+c)
Now move a, b and c and see the effect on the parabola y = ax2 + bx + c.



giac documentation written by Bernard Parisse