my matlab doesn't recognize 'besselzer​o(...,...,​...)', any help?

I am trying to write a code for an assignment which requires to use the roots of a bassel of first kind. I looked up and found a function that can be used to find the bassel function.

besselzero calculates the zeros of Bessel function of the first and second kind

x = besselzero(n)

x = besselzero(n, k)

x = besselzero(n, k, kind)

I tried using it and it failed. I have been scowering through internet why, but can't seem to find how to make it work.

>> z = besselzero(0, 1000,1);
Unrecognized function or variable 'besselzero'.
 
>> z = besselzero(0, 100,1);
Unrecognized function or variable 'besselzero'.
 
>> z = besselzero(0, 10,1);
Unrecognized function or variable 'besselzero'.

Answer 1

[KSSV]

It is not a inbuilt function. You need to download it from the place you have reffereed it to. You can copy the function from the link:

https://github.com/jinwar/matnoise/blob/master/besselzero.m

[Aashish Karna]

It worked. Thank you very much!

[Fulbert Nguepi]

sil vous plait comment introduire la fonction besselzeros sur matlab?

[Walter Roberson]

@Fulbert Nguepi

Download it from https://raw.githubusercontent.com/jinwar/matnoise/master/besselzero.m and store it somewhere on your MATLAB path.