how to implement Bessel's function in MATLAB

2 次查看（过去 30 天）
NIHAD MOHAMED ALI
NIHAD MOHAMED ALI 2021-1-16
评论： NIHAD MOHAMED ALI 2021-2-10
i want to find the solution of this bessels function mentioned
please help me to model the same in matlab or simulink

请先登录，再回答此问题。

采纳的回答

Walter Roberson
Walter Roberson 2021-1-16
编辑：Walter Roberson 2021-1-16
https://www.mathworks.com/help/matlab/ref/besselj.html for the numeric version
https://www.mathworks.com/help/symbolic/besselj.html for the symbolic version
When Bessel functions are being used, it is not uncommon to find that you need higher precision than double precision can provide, so it is common to need to use the symbolic version. To be more precise, often calculation of the values needs a higher range than double precision can support: it is common to end up with formulas that involve the ratio of two large numbers, and even though the ratio might be in the 1/1000 to 2 range, the individual numbers overflow to infinity in double precision.
  10 个评论
显示 8更早的评论
Walter Roberson
Walter Roberson 2021-2-10
Ran in:
Remember, besselj(1,sigma) is a constant value, and diff() of a constant value is 0. You did something similar to
syms X
f(X) = X^2
f(X) = 
x = 3
x = 3
diff(f(x))
ans = 
0
df = diff(f)
df(X) = 
df(x)
ans = 
6
When x is a particular number, f(x) is a point, not a line, and diff() of a point is 0. You need to differentiate the function and then substitute the particular number into the result.

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Bessel functions 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by