Neither LaTeX nor R have a concept of block comments.

there are some ugly workarounds in tex: not sure if the latex bundle supports any other them
http://tex.stackexchange.com/questions/87303/multi-line-block-comments-in-latex

On 18 Mar 2016, at 8:15 pm, Ross Ahmed <rossahmed@googlemail.com> wrote:
I use R and LaTeX. Is folding comments possible in these two languages?

Ross Ahmed

On Mar 18, 2016, at 9:49 AM, Ross Ahmed <rossahmed@googlemail.com> wrote:

Is it possible to have TextMate handle comments in the same way i.e.  hidden or somehow separated from text?

It depends on the language and syntax of the comments. For block comments in many languages you can use code folding to accomplish this. m.