how to add laguerre function L(n,a,x) manually in matlab

When I call laguerreL(1,2,2) in my matlab 2012, it gives "undefined function "laguerreL " for input arguments of type 'double', So I guess, it need to add this function manually,

Please Help

[KSSV]

This function is introduced in 2014b...

Answer 1

[KSSV]

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https://in.mathworks.com/matlabcentral/fileexchange/15916-generalized-laguerre-polynomial