On Fri, 2003-11-14 at 02:01, frerejacque wrote:
chengj a écrit : Hi ! Now I found a big problem : bessely(4.5,6) = -0.9846543023 in OPEN OFFICE =-0.98465430170 in excel But when I compute Bessely using MATLAB ,the result was -0.05459791739132 ( -0.05459791739132197 in Mathematica) some one who can tell me which one is right ????? Thank you very much !!!----------------------------------------------------------------- Well, there is a book issued in 1966 by the National Bureau of Standards for $6.50 in 1966 and tabulating a lot of special functions with some mathematics too: Assuming the question is the value of the Bessel function: Y, of fractional order 4.5 for x=6.
Ah, but that is not what bessely(4.5,6) in XL, gnumeric, and OO stands for. bessely(4.5,6) is the value of the Bessel function Y of order 6 for x=4.5. Andreas
Looking at page 437: Y(4.5, x) = sqrt((2x)/pi)* y(4, x) --------------------------------- y beeing the spherical bessel function of the second kind. y(4,x) is tabulated to 5 places in table 10.2 page 462 and y(4, 6)= -2.7936E-2. back to the hand computing device and Y(4.5, 6) = sqrt(12/pi)*-2.7936E-2 = - 0.054598 with five decimal places: CONCLUSION: The value given in Mathematica and Mathlab agrees with ye old math tables. Why OPPENOFFICE and EXCEL do'nt is an other problem Daniel Frerejacque Paris (France) ------------------------ _______________________________________________ gnumeric-list mailing list gnumeric-list gnome org http://mail.gnome.org/mailman/listinfo/gnumeric-list
-- Andreas J. Guelzow Taliesin Software, Shelties, Pyrsheps and Shetland Sheep
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