"ghasem " <email@example.com> wrote in message <firstname.lastname@example.org>... > Hi. > how solve an complicated equation including bessel functions,when my unknown and my initial guesses are complex? > my code is as following: (is within a for loop) > > syms bet % bet is my unknown > for i = 1: 100 > % eps1 , k1,k2,k0 are complex constant. > gam = sqrt(bet^2 - k1^2); > T = sqrt(bet^2 - k2^2); > tau = sqrt(bet^2 - k0^2); > % > X1 = gam*besseli(0,gam); > X2 = T*(eps1*besseli(1,gam)-(1-eps1)*gam.*besseli(0,gam)); > > X3 = -T*tau*bessely(0,T)*besselk(1,tau)-... > tau^2*bessely(1,T)*besselk(0,tau); > X4 = -T*tau*besselj(0,T)*besselk(1,tau)-... > tau^2*besselj(1,T)*besselk(0,tau); > > exp1(i) = X1.*(besselj(1,T).*X3 - bessely(1,T).*X4)-... > X2.*(besselj(0,T).*X3 - bessely(0,T).*X4); > > my_guess = (i/100) +1j*(k0+(i/m)); > exp2(i) = fsolve(@(bet)eval(exp1(i)),guess); > > real_ans(i) = real(exp2(i)); > imag_ans(i)= imag(exp2(i)); > end > ==================================== > I think that fsolve is not exact.because my answers are not simillar to my reference. > is there any better method,instead fsolve? > ghasem
What variables are changed within your for-loop ? The complex constants eps1, k0, k1 and k2 ?