Question

这是一个错误吗？

> nchar(sprintf("%-20s", "Sao Paulo"))
[1] 20
> nchar(sprintf("%-20s", "São Paulo"))
[1] 19

> sessionInfo()
R version 3.2.4 (2016-03-10)
Platform: x86_64-apple-darwin13.4.0 (64-bit)
Running under: OS X 10.11.4 (El Capitan)

locale:
[1] en_GB.UTF-8/en_GB.UTF-8/en_GB.UTF-8/C/en_GB.UTF-8/en_GB.UTF-8

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

loaded via a namespace (and not attached):
[1] tools_3.2.4    fortunes_1.5-2

Answer 1

> nchar(sprintf("%-20s", "Sao Paulo"), type = "bytes")
[1] 20
> nchar(sprintf("%-20s", "São Paulo"), type = "bytes")
[1] 20

Answer 2

如果您阅读了sprintf的帮助页面，它会谈到编码很重要的事实。如果您查看nchar的帮助页面，您还会了解到有不同的类型。

因此，我看到以下内容（在Linux，R 3.3.0 beta上）：

> nchars <- function(x) vapply(c("bytes","chars","width"),
                               function(typ) nchar(x, type=typ), 1)
> sp <- "São Paulo"
> Encoding(sp)
[1] "UTF-8"
> nchars(sp)
bytes chars width 
   10     9     9 
> nchars(sprintf("%-20s", sp))
bytes chars width 
   20    19    19 
>

所以我声称没有任何错误。我不是说@TheRimalaya，而是在得出不同的结论

sprintf似乎忽略了一些特殊字符

2 个答案: