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How to use Sys.time() while writing a csv file name
5 messages · Vincy Pyne, Pascal Oettli, Jeff Newmiller +1 more
Hello, Try something like that: > lgd <- format(Sys.time(), "%Y_%m_%d_%H_%M_%S") Regards, Pascal Le 04/07/2012 14:21, Vincy Pyne a ?crit :
Dear R helpers,
I am using Beta distribution to generate the random no.s (recovery rates in my example). However, each time I need to save these random no.s in a csv format. To distinguish different csv files, one way I thought was use of Sys.time in the file name. My code is as follows -
# My code
rr = rbeta(25, 6.14, 8.12)
lgd = 1 - mean(rr)
write.csv(data.frame(recovery_rates = rr), file = paste("recovery_rates_at_", Sys.time(), ".csv", sep = ""), row.names = FALSE)
However, I get following error -
Error in file(file, ifelse(append, "a", "w")) : cannot open the connection
In addition: Warning message: In file(file, ifelse(append, "a", "w")) :
cannot open file 'recovery_rates_at_2012-07-04 1:14:05.csv': Invalid argument
If instead of Sys.time, I use some other variable e.g. lgd as
write.csv(data.frame(recovery_rates = rr), paste('rates_',lgd,'.csv', sep = ""), row.names = FALSE)
I am able to store these simulated recovery rates in different files. But I need to use Sys.time in my csv file name. (or is there any other way of writing these csv files so that files don't get over-written).
Kindly guide.
Regards and thanking in advance
Vincy
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You forgot to follow the posting guide and tell us what operating system you are using (sessionInfo), but I am going to guess that you are on Windows where the colon (":") is an illegal symbol in filenames. Try formatting the time explicitly in the conversion to character using the format string definitions found in ?strptime in a format that doesn't include colons.
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Vincy Pyne <vincy_pyne at yahoo.ca> wrote:
Dear R helpers,
I am using Beta distribution to generate the random no.s (recovery
rates in my example). However, each time I need to save these random
no.s in a csv format. To distinguish different csv files, one way I
thought was use of Sys.time in the file name. My code is as follows -
# My code
rr = rbeta(25, 6.14, 8.12)
lgd = 1 - mean(rr)
write.csv(data.frame(recovery_rates = rr), file =
paste("recovery_rates_at_", Sys.time(), ".csv", sep = ""), row.names =
FALSE)
However, I get following error -
Error in file(file, ifelse(append, "a", "w")) : ? cannot open the
connection
In addition: Warning message: In file(file, ifelse(append, "a", "w")) :
cannot open file 'recovery_rates_at_2012-07-04 1:14:05.csv': Invalid
argument
If instead of Sys.time, I use some other variable e.g. lgd as
write.csv(data.frame(recovery_rates = rr), paste('rates_',lgd,'.csv',
sep = ""), row.names = FALSE)
I am able to store these simulated recovery rates in different files.
But I need to use Sys.time in my csv file name. (or is there any other
way of writing these csv files so that files don't get over-written).
Kindly guide.
Regards and thanking in advance
Vincy
[[alternative HTML version deleted]]
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Hello,
It seems that there is a problem with ":".
If you only need the date, you can use as.Date(Sys.time()) instead of the
complete form.
If you need the time, you can try the following commands which change the
":" into "-" :
newsystime<-<-format(Sys.time(),"%Y-%m-%d-%H-%M-%S")
write.csv(data.frame(recovery_rates = rr), file =
paste("recovery_rates_at_", newsystime, ".csv", sep = ""), row.names =
FALSE)
Have a good day,
Ptit Bleu.
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