INVOKE_PLOT_UPDATES = True

p=None
def start_plot():
    global p
    p = plot([None, None, None,None, None], ["TEY", "TFY", "TEYraw", "TFYraw", "I0"])


def _update_plots(p, x, s0, s1, s2, s3, s4):
        p[0].getSeries(0).setData(x, s0)
        p[1].getSeries(0).setData(x, s1)
        p[2].getSeries(0).setData(x, s2)
        p[3].getSeries(0).setData(x, s3)
        p[4].getSeries(0).setData(x, s4)

def update_plot():
    global p
    #c = count.take()
    c=10
    if c is None:
        for i in range(len(p)):
             p[i].getSeries(0).clear()
    else:
        """
        data.setSize(c)
        fdata.setSize(c)
        idata.setSize(c)
        edata.setSize(c)
        teyr= data.read()
        tfyr= fdata.read()
        i0 = idata.read()
        x = edata.read()
        """
        teyr = [10,11,12,13,14,15,16,17,18,19] 
        tfyr = [20,21,22,23,24,25,26,27,28,29] 
        teyr = [30,31,32,33,34,35,36,37,38,39] 
        i0 = [0,1,2,3,4,5,6,7,8,9]
        x = [0,1,2,3,4,5,6,7,8,9]
        
        #from operator import truediv
        l = lambda x,y: (0.0 if (y==0.0) else x/y)  #truediv
        tey=map(l, teyr, i0)
        tfy=map(l, tfyr, i0)

        args = [ p, x,  to_array(tey,'d'), 
                        to_array(tfy,'d'),
                        to_array(teyr,'d'),
                        to_array(tfyr,'d'),
                        to_array(i0,'d')]
        if INVOKE_PLOT_UPDATES:
            invoke([_update_plots, args])
        else:
            _update_plots(*args)

start_plot()
for i in range(10):
    update_plot()