[ESS] When the R window opens, sometimes it is side-by-side with my .Rnw file. I want them one above the other. It seems unpredictable

[Karlo Guidoni Martins]

You can control both window size and position setting the
display-buffer-alist variable in your init.el file. The following snippet
should work:
(setq display-buffer-alist
      `(("*R"
         (display-buffer-reuse-window display-buffer-at-bottom)
         (slot . 1)
         (window-height . 0.3)
         (reusable-frames . 0)))

Also, have a look at:
https://ess.r-project.org/Manual/ess.html#Controlling-buffer-display




On Fri, May 27, 2022, 18:27 Christopher W. Ryan via ESS-help <
ess-help using r-project.org> wrote:

> I'm using Vince Goulet's modified version of emacs 26.2 (build 1,
> x86_64-w64-mingw32)  of 2019-04-13 with ESS, on Windows 10. I use Sweave
> and LaTeX, so I have my R code in .Rnw files. When I execute my first
> line of R code, an R buffer opens of course. I prefer it to be below my
> Rnw buffer. Sometimes it is. But other times the R buffer opens to the
> side. It's unpredictable, which is disconcerting; I have not been able
> to discern a pattern.  How can I ensure that every time emacs/ESS opens
> an R buffer, the emacs window is split top-and-bottom, rather than
> side-by-side.
>
> Thanks.
>
> --Chris Ryan
>
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