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G2++: Swaption analytic formula

Discussion in 'Computing' started by Andrea, 11/15/08.

  1. Andrea

    Andrea New Member

    Hi all,
    i'm trying to build the analytic formula of an european swaption ,in Matlab, by following Brigo-Mercurio pag.158-59.

    I'm using the parameters present in the book (a=0.7735, b=0.08201, sigma=0.02228; eta=0.01038, rho=-0.7019), but when i try to calculate the


    the value, with T=2(maturity), is -1.033.

    The problem is that when i have to calculate the h1_x the value sqrt(1-rho_xy^2) is negative, and that is impossible and it creates an error.

    Do someone have any suggestions??????

    Thank you
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