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I agree that the object is non-linear. At least the rate of return part is linear. I cannot expose too much about the detail of the algorithm. You can change the rrr and play with it to see if it is a local optimal point. :)

This tool's(http://quicark.com/OptimalPortfolio.aspx) principle is: if prices of securities happened in the past, it will happen in the future in a similar way. From this point of view, we can value the risk as the value fluctuation diverse from the mean route of the portfolio. The...

The tool http://quicark.com/OptimalPortfolio.aspx (how to use it http://quicark.com/OptimalPortfolioHelp.aspx) can help traders to determine what/how many you need to buy based on your cash, expected return and risk. You need to pick up the stocks by yourself for your portfolio.

You can look at http://quicark.com/OptimalPortfolio.aspx and http://quicark.com/OptimalPortfolioHelp.aspx. Hope his may help.

www.quicark.com has a margin calcultor and it's free for limited time