MCMC - Metropolis Hastings

Dear Experts, May I have a question? I`m trying to code up MCMC with Metropolis - Hasting using the mhsample command. The documentation says that the arguments x and y have to be the same size as the row vector of the initial values. I am trying to draw from three variables (3 initial values) but it does not work. Do you have any ideas how shall I proceed? Thank you very much in advance for your help.

[the cyclist]

Can you post the code that you have tried? That should help us diagnose any issues.

[Anita]

thank you, it is clear now.

Answer 1

[Anita]

problem solved, obviously a joint pdf was needed.