how to implement Bessel's function in MATLAB

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NIHAD MOHAMED ALI
NIHAD MOHAMED ALI el 16 de En. de 2021
Comentada: NIHAD MOHAMED ALI el 10 de Feb. de 2021
i want to find the solution of this bessels function mentioned
please help me to model the same in matlab or simulink

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Walter Roberson
Walter Roberson el 16 de En. de 2021
Editada: Walter Roberson el 16 de En. de 2021
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.
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Walter Roberson
Walter Roberson el 10 de Feb. de 2021
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.
NIHAD MOHAMED ALI
NIHAD MOHAMED ALI el 10 de Feb. de 2021
yes, clealy understood my mistake ; thanks a bunch

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