import random

title = "test"
p = None
def add_plot(x,y, name=None):
    global title
    global p
    plots = get_plots(title = title)
    if len(plots)==0:
        p = plot(None,name="Data 1")[0]        
        p.setLegendVisible(True)
    else:
        p = plots[0]    
        p.addSeries(LinePlotSeries(name))            
    s = p.getSeries(name)
    s.setData(x, y) 
        



x=[]
y=[]

for step in range(1,2):
    x=[]
    y=[]    
    for i in range(100):
        x.append(random.random() * 100 / step)
        y.append(random.random() * 100/ step)        
    add_plot (x,y,"Step " + str(step))