# DIDI Index
# Nov/08/2014
# jaimepinto@rogers.com

declare lower;

input price = close;
input short_length = 3;
input mid_length   = 8;
input long_length  = 20;

def sEMA = ExpAverage(price, short_length);
def mEMA = ExpAverage(price, mid_length);
def lEMA = ExpAverage(price, long_length);

plot s = sEMA / mEMA - 1;
plot l = lEMA / mEMA - 1; 

s.AssignValueColor(Color.GREEN);
l.AssignValueColor(Color.RED);

plot zeroline = 0;
zeroline.AssignValueColor(Color.GRAY);