Thank you very much Rui. I was in hurry because I'm working in a bank and on my master's degree thesys at the same time. I know Matlab, but they want I use R to price a convertible bond (I can't get why...). I read "An introduction to R" the last week-end and now I feel more confortable. This is an help section and was not looking for a good telling-off but I'm sorry if I bothered somoone with my question.
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