[Rd] Xll.options().

From: Rolf Turner <r.turner_at_auckland.ac.nz>
Date: Mon, 08 Aug 2011 12:49:44 +1200

This question seemed to me to be more appropriate for r-devel than for r-help. My apologies if this is not the case.

Recently I installed ``cairo'' on my lap-top so that I could make use of the (newish) polypath() function, with on-screen graphics. (The polypath() function does not work with X11(type="Xlib").)

The installation went smoothly, X11(type="cairo") works just fine, and polypath() works just fine.

However the default "type" for X11() remains "Xlib" rather than "cairo".

The help for X11.options() says (in respect of "type"):

     Default "cairo" where available and reliable, otherwise "Xlib".

Now "cairo" is definitely available:

> capabilities()["cairo"]


and moreover it works (just fine!) when I do X11(type="cairo") explicitly.

I know that I can set the default to be "cairo" in my .Rprofile, but I am curious as to why "cairo" does not become the default automatically.

Is it the case that "cairo" is ``not reliable'' under my system? It ***seems***
to be reliable.

> sessionInfo()

R version 2.13.1 Patched (2011-07-17 r56404) Platform: i686-pc-linux-gnu (32-bit)


  [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C
  [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8
  [5] LC_MONETARY=C              LC_MESSAGES=en_US.UTF-8
  [7] LC_PAPER=en_US.UTF-8       LC_NAME=C
  [9] LC_ADDRESS=C               LC_TELEPHONE=C

attached base packages:
[1] datasets utils stats graphics grDevices methods base

other attached packages:

[1] misc_0.0-13     gtools_2.6.2    spatstat_1.23-1 deldir_0.0-15
[5] mgcv_1.7-6      fortunes_1.4-2  MASS_7.3-13

loaded via a namespace (and not attached):
[1] grid_2.13.1        lattice_0.19-30    Matrix_0.999375-50 nlme_3.1-101


         Rolf Turner

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