Plotting the ASCII character set.
On 03/07/2021 9:59 p.m., Rolf Turner wrote:
... deletia ...
Also note that there is a bit of difference between the results of using
Encoding() and the results of using iconv(). E.g. if I do
a <- "\x80"
b <- iconv(a,"latin1","UTF-8")
Encoding(a) <- "latin1"
then when I type "a" I get the Euro symbol "?", but when I type "b"
I get the string "\u0080"
But that doesn't really matter. More problematic is the fact that if I
do either
plot(0,0,type="n",xlim=c(0,1),ylim=c(0,1),ann=FALSE,axes=FALSE)
text(0.5,0.5,labels=a,cex=6)
or
plot(0,0,type="n",xlim=c(0,1),ylim=c(0,1),ann=FALSE,axes=FALSE)
text(0.5,0.5,labels=b,cex=6)
then I get wee rectangle with 0 0 8 0 arranged in a 2 x 2 array inside.
(Setting cex=6 makes it easier for my ageing eyes to see what the
digits are.)
Is there any way that I can get the Euro symbol to display correctly in
such a graphic?
The problem with the Euro symbol is that it was invented after the first 8 bit encodings, so it was stuck in later. If you want it, this seems helpful: From https://web.stanford.edu/~laurik/fsmbook/faq/utf8.html: "The proper Unicode code point for ? [this may or may not display correctly as the Euro sign in your browser] is decimal 8364 (0x20AC). In Windows CP1252 ? has the code 128 (0x80); in ISO-8859-15 (also known as Latin-9) the ? code is 164 (0xA4); in Macintosh Roman it is 219 (0xDB)." So a fairly portable way to display it would be "\u20ac". That works in a plot on my Mac; on other graphics devices it depends on whether the glyph is defined, but I'd expect it is fairly widespread. The "\x80" character varies across 8 bit encodings. In many of them it's a non-printable character, but not on Windows. Duncan Murdoch