如何在pdf中使用UTF-8编码的字符矢量?

尝试使用将整数转换为UTF-8编码的字符向量 intToUtf8 设置 pch= 。

(.pch <- c(intToUtf8(9675), intToUtf8(9679)))
# [1] "○" "●"

虽然它对 png ,

png('foo.png', 400, 400)

with(df, plot(x, y, pch=.pch[(z < 0) + 1], xlim=0:1, ylim=0:1))
legend('topleft', pch=.pch, legend=letters[1:2])

dev.off()

不会的 pdf ,

pdf.options(encoding='ISOLatin2.enc')
pdf('foo.pdf', 4, 4)

with(df, plot(x, y, pch=.pch[(z < 0) + 1], xlim=0:1, ylim=0:1))
legend('topleft', pch=.pch, legend=letters[1:2])

dev.off()

但我想要 pdf 。

也尝试过 'ISOLatin1.enc' 但无济于事。

> sessionInfo()
R version 4.3.1 (2023-06-16)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 22.04.3 LTS

Matrix products: default
BLAS:   /usr/lib/x86_64-linux-gnu/blas/libblas.so.3.10.0 
LAPACK: /usr/lib/x86_64-linux-gnu/lapack/liblapack.so.3.10.0

locale:
 [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=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=en_US.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

time zone: Europe/Zurich
tzcode source: system (glibc)

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

loaded via a namespace (and not attached):
[1] compiler_4.3.1 tools_4.3.1   

数据:

df <- structure(list(x = c(0.2, 0.6, 0.7, 0.9), y = c(0.4, 0.7, 0.9, 
0.5), z = c(-1, -1, 1, 1)), class = "data.frame", row.names = c(NA, 
-4L))