Plotting a nice function

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Sergio Manzetti
Sergio Manzetti 2021-6-14
回答： Reshma Nerella 2021-6-17
Hi, I have prepared the given code for the following function:
syms r x y k z
x = -10:0.3:10;
y = x';
z = x + 1i*y;
scale = 1;
J = besselj(5,r)
u = symsum(1i.^(-k).*J.*exp(1i*k*x),k,-5,5)
surf(r,x,imag(u))
But the plot doesn't work, I only get z must be a scalar or a vector. In fact, I have my doubts about the plotting command, because this is a polar function shown in the image, and not a cartesian function.
How I can get this plot similar to this:
https://se.mathworks.com/help/matlab/ref/besselj.html#:~:text=J%20%3D%20besselj(%20nu%20%2C%20Z%20)%20computes%20the%20Bessel%20function,overflow%20or%20loss%20of%20accuracy.
?
Thanks!

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回答（1 个）

Reshma Nerella
Reshma Nerella 2021-6-17
Hi,
The 3rd argument(Z) to the surf function should be a matrix with atleast 2 rows and 2 columns.
In this line of code,
surf(r,x,imag(u))
imag(u) is 1x67 sym, hence you are getting the error.
For more information on the input arguments and surf function, refer to the documentation: surf

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