Do you think this is the right way to allocate capital in positions for an automated trading system? Questions for position allocation for capital to deploy

This position management script is probably the most confusing to develop. Some outstanding questions shall remain for the more evolved trader:

1. We get the position weighting allocation for the first trade, but what about the next trade? DO we re-run this script but what happens to the current open positions. How do you re-allocation the weighting of capital already deployed? What happens when you don’t have any remaining capital, do close other positions or just just not open a new position?

2. For the calculation on $ of shares to assign based on current price? do we the past entry price from the database for current open positions?
– See more at: http://quantlabs.net/blog/2014/11/is-thie-right-way-to-allocate-capital-in-positions-for-an-automated-trading-system-questions-for-position-allocation-for-capital-to-deploy/#sthash.HeTt0zOb.dpuf