Volume-Weighted Indicators VWMA/VWAP/EMA_by WW

As traders and investors now urge to console volume factors into their price action analysis. This script is an attempt to combine volume-weighted moving average (VWMA), volume-weighted average price (VWAP), along with the exponential moving average (EMA). I have found that this indicator works quite well with the stock market.

How to use the indicator:
Buy when the VWAP and EMA lines crossing up VWMA.
Sell when the VWAP and EMA crossing down each other OR both VWAP and EMA crossing down VWAP

Any modificatio is welcomed, but please let me know.