# how to implement Bessel's function in MATLAB

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NIHAD MOHAMED ALI on 16 Jan 2021
Commented: NIHAD MOHAMED ALI on 10 Feb 2021
i want to find the solution of this bessels function mentioned

Walter Roberson on 16 Jan 2021
Edited: Walter Roberson on 16 Jan 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.
Walter Roberson on 10 Feb 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 on 10 Feb 2021
yes, clealy understood my mistake ; thanks a bunch

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