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function blkimpv gives wrong answers

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Nan Shen
Nan Shen 2013-9-20
I am using blkimpv to calculate implied vol from the market. Attached is parameters I used in the function. Why it alway gives me Not a Number -- NAN? And it also gives strange numbers when I change the values in the parameters.
Volatility = blkimpv(40.85, 40, 0.0025, 0.0219, 0.35, [],[], {'Call'})

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