; The parameter a of interest, and its range are defined:
a := 4
a.minimum := 0
a.maximum := 5
; In DPGraph up to 4 parameters can be defined:
b := 1
b.minimum := -2
b.maximum := 2
c := 1
c.minimum := -2
c.maximum := 2
d := 1
d.minimum := -2
d.maximum := 2
graph3d.box := true
graph3d.mesh := true
graph3d.view := top
graph3d.perspective := false
graph3d.resolution := 100
graph3d.color := byheight
graph3d.background := white
graph3d.minimumx := 0
graph3d.maximumx := 1
graph3d.minimumy := 0
graph3d.maximumy := 1
graph3d.minimumz := 0
graph3d.maximumz := .01
; The command to generate the graph
; must be the last line in the file. The equations for the map
; and its iterates must be entered manually.
graph3d( (y=a*x*(1-x), y=a^2*x*(1-x)*(1-a*x*(1-x)),y=a^3*x*(1-x)*(1-a*x*(1-x))*(1-a^2*x*(1-x)*(1-a*x*(1-x))),y=x) )