How to get commands history as a character vector instead of displaying them?
Yihui Xie wrote:
Hi Everyone, I want to get the commands history as a character vector instead of just displaying them, but the function history() just returns NULL. I checked the source code of 'history' and could not find a solution. Anybody has an idea? Thanks!
history eventually calls file.show, which will use the pager option to
determine how to show the file, so you can do something like that:
history <- function( ... ){
old.op <- options( pager = function( files, header, title, delete.file )
readLines( files ) ); on.exit( options( old.op ) )
utils::history(...)
}
history( pattern = "png" )
I don't see a way to get device information other than the name of the
device (with dev.cur)
Romain
P. S. My original problem is, when a user opens a graphics device like png() or pdf(), I want to know the file name used by this device. I thought history() would help, but it could not.
sessionInfo()
R version 2.8.1 (2008-12-22) i386-pc-mingw32 locale: LC_COLLATE=Chinese_People's Republic of China.936;LC_CTYPE=Chinese_People's Republic of China.936;LC_MONETARY=Chinese_People's Republic of China.936;LC_NUMERIC=C;LC_TIME=Chinese_People's Republic of China.936 attached base packages: [1] stats graphics grDevices utils datasets methods base Regards, Yihui -- Yihui Xie <xieyihui at gmail.com> Phone: +86-(0)10-82509086 Fax: +86-(0)10-82509086 Mobile: +86-15810805877 Homepage: http://www.yihui.name School of Statistics, Room 1037, Mingde Main Building, Renmin University of China, Beijing, 100872, China
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Romain Francois Independent R Consultant +33(0) 6 28 91 30 30 http://romainfrancois.blog.free.fr