st: How do I solve an equation with returns in 'x' and my searched parameterin 'y' for a whole dataset?

[Daniel Klein <dklein@wiwi.uni-frankfurt.de>]

My problem is how to get implied volatilities out of option prices. I 
have the options prices and I want to get implied volatilities out of 
them. My variable 'x' contains option prices, variable 'y' contains only 
missings. How do I get stata filling 'y' with values (volatility) 
solving my option pricing formula (Black-Scholes) ?

sincerely

D.K.
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