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)
a
, b
and c
and see the effect
on the parabola
y = ax2 + bx + c.