"Too many input arguments." error in slicesample command execution

Dear Matlab community,

I tried using the slicesample function in the Statistics toolbox by running the following example:

f = @(x) exp(-x.^2/2).*(1 + (sin(3*x)).^2).*...
  (1 + (cos(5*x).^2));
N = 2000;
x = slicesample(1,N,'pdf',f);

I get the following error:

Error using slicesample
Too many input arguments.

What is going wrong? By using "ver", I know I do have the Statistics toolbox installed

Statistics Toolbox                                    Version 8.2

Best regards!

Khoa.

[Khoa Tran]

I've realised that in a local folder, I have another m-file with the same name so the cause of my problem. Never mind, I fixed it now.