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I'm pretty new at using Mathematica, so I sometimes find errors in stuff so simple I can't seem to find where the error is.
I've been trying to solve a trascendental equation that involves a number of Bessel's functions, and I can't seem to find why it doesn't work.
Here it goes.
a = 0.889; b = 2.946; Er = 2.2; f[x_, n_] := BesselJ[n, a*x] BesselY[n, b*x] - BesselJ[n, b*x] BesselY[n, a*x]; NSolve[f[x, 0] == 0, x];
Has it something to do with it being an infinite number of solutions, or something like that?
Thanks in advance.
PD : I tried giving it an interval as march suggested, but I got an error I don't understand. What does it mean?
Solve::ratnz: Solve was unable to solve the system with inexact coefficients. The answer was obtained by solving a corresponding exact system and numericizing the result. >>