How to write a Bessel function but with my own set values?

   clc,clear,clf

 ka = [0.05, 0.1, 1.0, 2.5, 5.0, 7.5, 10]

 theta = 0:pi;

 nu = ka.*sin(theta)

 H = abs((2*besselj(0,nu))/(nu));

 figure(1)

 fplot(H)

 axis([0 12 -0.5 1.1])

 grid on

origial formula is abs(2*J(nu)/(nu)) with nu=ka*sin(theta)

I get an error message "Matrix dimensions must agree"

and if i do theta = 0:2*pi; I get a straight line.

Answer 1

[Torsten]

"ka" is 1x6, "theta" is 1x4. What do you expect "nu" to be ?

At least you will have to set

H = abs(2*besselj(0,nu)./nu);

Best wishes

Torsten.