@shayeste I updated your first post to encapsulate code with ``` and the end of your code block. You may highlight R, Python, Stan and a variety of other languages by writing ```stan.
It helps people to see the problem more clearly when the issue is laid out in a more readable format. We’re going to post some notes on how to ask questions on the forum but we don’t have it yet! Right now it’s in discussion at Forum question posting guideline - #4 by yizhang. Feel free to add to it as well with your experience as a new poster.
Thanks and welcome to the Stan community!