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What are the parameters of the function PORTVAR in Matlab?

According to the Matlab help, Portvar will give the "Variance for portfolio of assets" by entering the returns of the Assets and the corresponding weight. However, it does not explain the parameters ...
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How to price an option on a dividend-paying stock using the binomial model?

This is actually an exercise from a course. But I don't completely understand the wording of the question. A stock is now trading at 100 dollars. Its price over the next 6 months evolves as a two ...
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API for after and pre market data

Is there an API or APIs similar to the Yahoo! or Quandl APIs, that give the same access to pre and after market data? I know I can scrape the Nasdaq or Yahoo! Finance sites to get a pre/after market ...