On 2023/5/11 17:22, Ivan Krylov wrote:
В Thu, 11 May 2023 16:56:41 +0800
Jinsong Zhao <jsz...@yeah.net> пишет:
When I run the following code in R 4.3.0 on FreeBSD, I got error.
> as.POSIXct("1970-01-01 00:00.00 UTC")
Error in as.POSIXlt.character(x, tz, ...) :
character string is not in a standard unambiguous format
Do strptime("1970-01-01 00:00.00 UTC", "%Y-%m-%d %H:%M", '') and
strptime("1970-01-01 00:00.00 UTC", "%Y-%m-%d", '') both return NA for
you on FreeBSD? If not, can you trace the execution using R's debugger
to see which parts are returned as NA, failing the test in
as.POSIXlt.character?
Both codes do not return NA on FreeBSD:
> strptime("1970-01-01 00:00.00 UTC", "%Y-%m-%d %H:%M", '')
[1] "1970-01-01 CST"
> strptime("1970-01-01 00:00.00 UTC", "%Y-%m-%d", '')
[1] "1970-01-01 CST"
I do not know how to use R's debugger...
I think that strptime() should have discarded the trailing parts of the
string and matched at least the beginning (though not the ".00 UTC"
part because it doesn't correspond to the formats tried by strptime()).
Moreover, there shouldn't be significant difference between the
platforms, because R seems to always use an internal implementation of
strptime(). Are you using a multi-byte locale? (What's your
sessionInfo() on both a system where it works and the system where it
fails?)
The sessionInfo on FreeBSD said:
tzcode source: system (FreeBSD)
But on Windows it said:
tzcode source: internal
Could it be because of this?
The sessionInfo on FreeBSD is:
> sessionInfo()
R version 4.3.0 (2023-04-21)
Platform: amd64-portbld-freebsd13.1 (64-bit)
Running under: FreeBSD xw6600 13.2-RELEASE FreeBSD 13.2-RELEASE
releng/13.2-n254617-525ecfdad597 GENERIC amd64
Matrix products: default
LAPACK: /usr/local/lib/R/lib/libRlapack.so.4.3.0; LAPACK version 3.11.0
locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
time zone: Asia/Shanghai
tzcode source: system (FreeBSD)
attached base packages:
[1] stats graphics grDevices utils datasets methods base
loaded via a namespace (and not attached):
[1] compiler_4.3.0
The sessionInfo on Windows is:
> sessionInfo()
R version 4.3.0 (2023-04-21 ucrt)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 11 x64 (build 22621)
Matrix products: default
locale:
[1] LC_COLLATE=Chinese (Simplified)_China.utf8
[2] LC_CTYPE=Chinese (Simplified)_China.utf8
[3] LC_MONETARY=Chinese (Simplified)_China.utf8
[4] LC_NUMERIC=C
[5] LC_TIME=Chinese (Simplified)_China.utf8
time zone: Asia/Shanghai
tzcode source: internal
attached base packages:
[1] stats graphics grDevices utils datasets methods base
loaded via a namespace (and not attached):
[1] compiler_4.3.0 tools_4.3.0
>
The sessionInfo on CentOS is:
> sessionInfo()
R version 4.1.2 (2021-11-01)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: CentOS Linux 7 (Core)
Matrix products: default
BLAS: /home/jszhao/software/lib64/R/lib/libRblas.so
LAPACK: /home/jszhao/software/lib64/R/lib/libRlapack.so
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
attached base packages:
[1] stats graphics grDevices utils datasets methods base
loaded via a namespace (and not attached):
[1] compiler_4.1.2
>
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