Update Visual.Graph Python

 The code below's from vpython example program, modified here and there, of course, :). It plots 5.0+5.0*cos(-0.2*t-p)*exp(0.015*t). Notice that p is act as phase, so the plot will 'walk'. The essential part is

 funct1.gcurve.pos=[]

 without it, the graph wont refresh the old curve (the old plot wouldn't be erased)

from __future__ import division, print_function
from visual import *
from visual.graph import *
import wx

L = 400
H = 200

w = window(width=2*(L+window.dwidth), height=L+window.dheight+window.menuheight+H,
           menus=True, title='Widgets',
           style=wx.SYSTEM_MENU | wx.CAPTION | wx.CLOSE_BOX)

funct1 = gcurve(color=color.cyan)

p = 0.

while True:
    rate(100)
    funct1.gcurve.pos=[]
    for t in arange(-30, 74, 1):
        funct1.plot( pos=(t, 5.0+5.0*cos(-0.2*t-p)*exp(0.015*t)) )
    p = p + 0.1
    if p >100:
        p = 0

.

.