Gerardo Moro <gerardomoro37@gmail.com> writes:

> I have been trying for over a year to change the output plot size when
> using Orgmode SRC blocks with R. I have tried both using orgmode settings
> and R settings.

Have you tried :with and :height header arguments?

> I have a table from which I take some values.

It would be more helpful if you provided a completely reproducible
example that others can also run.

Best,
Ihor