I have (used to have?) a function plot_ascii() which would display the
ascii character set in a graphical display. It simply used text() to
place the symbols on a 16 x 16 grid. The labels used by text() were
taken from a character vector that I called "all.ascii". According to
my notes, the entries of this vector were obtained from a posting to
R-help made by the redoubtable Martin Maechler back in 2002.
This function *used* to work! Now it doesn't. When I invoke
plot.ascii() I get an error:
> Error in text.default(tmp, labels = all.ascii) :
> invalid string in PangoCairo_Text
To give a simple example, just looking at *one* of the characters,
which comes from the string "\260" in my data file:
a <- "\260"
plot(0,0,type="n",xlim=c(0,1),ylim=c(0,1),ann=FALSE,axes=FALSE)
text(0.5,0.5,labels=a)
Same error. If I type the name a I get "\xb0", which I don't
understand. Can't get my head around character encoding.
If I do
plot(0,0,type="n",xlim=c(0,1),ylim=c(0,1),ann=FALSE)
text(0.5,0.5,labels="\ub0")
then I get the degree symbol plotted; I guess that b0 is the hex
encoding of the degree symbol; apparently 260 is the octal encoding of
this symbol.
Can anyone suggest how I might get my plot_ascii() function working
again? Basically, it seems to me, the question is: how do I persuade
R to read in "\260" as "\ub0" rather than "\xb0"?
I hope for enlightenment! :-)
cheers,
Rolf Turner
P.S. My sessionInfo() may be relevant:
R version 4.1.0 (2021-05-18)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 20.04.2 LTS
Matrix products: default
BLAS: /usr/lib/x86_64-linux-gnu/atlas/libblas.so.3.10.3
LAPACK: /usr/lib/x86_64-linux-gnu/atlas/liblapack.so.3.10.3
locale:
[1] LC_CTYPE=en_GB.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_NZ.UTF-8 LC_COLLATE=en_GB.UTF-8
[5] LC_MONETARY=en_NZ.UTF-8 LC_MESSAGES=en_GB.UTF-8
[7] LC_PAPER=en_NZ.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_NZ.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] brev_0.0-5
loaded via a namespace (and not attached):
[1] magrittr_1.5 usethis_2.0.1 devtools_2.4.2 pkgload_1.2.1
[5] R6_2.4.1 rlang_0.4.11 mixreg_1.0-1 fastmap_1.0.1
[9] tools_4.1.0 pkgbuild_1.2.0 sessioninfo_1.1.1 cli_2.5.0
[13] withr_2.4.2 ellipsis_0.3.2 remotes_2.4.0 rprojroot_1.3-2
[17] lifecycle_1.0.0 crayon_1.3.4 processx_3.5.2 purrr_0.3.4
[21] callr_3.7.0 fs_1.5.0 ps_1.6.0 testthat_3.0.3
[25] memoise_2.0.0 glue_1.4.0 cachem_1.0.5 compiler_4.1.0
[29] desc_1.3.0 backports_1.1.6 prettyunits_1.1.1
--
Honorary Research Fellow
Department of Statistics
University of Auckland
Phone: +64-9-373-7599 ext. 88276
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