Why Undefined function 'besselzero' for input arguments of type 'double'.

I m running this script from Matlab examples but it is giving me error: Undefined function 'besselzero' for input arguments of type 'double'.I am using Matlab 2014a. Here is the script from mathworks for this particular example.

n = (1:2)';
k = 10;
kind = 0;
z = besselzero(n, k, kind);
x = linspace(0, z(end), 1000);
y = nan(2, length(x));
y(1,:) = besselj(n(1), x);
y(2,:) = besselj(n(2), x);
nz = nan(size(z));
nz(1,:) = besselj(n(1), z(1,:));
nz(2,:) = besselj(n(2), z(2,:));
plot(x, y, z, nz,'kx')

Anyone pls suggest why such error appears. If it is license issue then pls suggest how should I define this "besselzero". Thanks

[Adam]

besselzero appears to be a function from the File Exchange. Where did you get the example code from?

[Anjali Sharma]

pls follow this link: https://in.mathworks.com/matlabcentral/fileexchange/48403-bessel-zero-solver

[dpb]

What does

which besselzero

return?

You have to put the m-file(s) from the FEX submission in a directory on your MATLABPATH or the current working directory and if it's downloaded as a zip collection of files unzip them...see what the FEX says about any install.

[Anjali Sharma]

Thanks. I simply copied this script and run on matlab. which besselzero returned not found at my end. This 'besselzero' could be any name..not compulsorily 'besselzero' as i had tried my script with different names also. All i m trying to produce this table as attached jpeg.

can you suggest something?

[dpb]

"which besselzero returned not found ...can you suggest something?"

As already did, to use besselzero you'll have to obtain it from FEX and place it in a directory on the MATLABPATH for it to be found; just like any other m-file you were to write has to be on the search path as outlined in folders-that-matlab-accesses

Answer 1

[Steven Lord]

Before you use functions that are part of an add-on from the File Exchange, you must download and install that add-on. If you're using a sufficiently recent release of MATLAB, search for "Add-Ons" in your documentation and find the equivalent of this page in your installation's documentation. If you use Add-On Explorer it will handle downloading the add-on, installing it, and ensuring it is on the MATLAB path. If you download it manually, you will need to install it and add it to the MATLAB path.