On Dec 17, 2012, at 9:44 AM, Nathan Skene wrote:
> I have a path:
>
> path = "/nfs/users/nfs_n/ns9/
> Phenotype Analysis/Results/Run_AmplRatio_neg
> BinaryAll trained without akapn+tnik.csv"
>
> I wish to replace the spaces with "\ " so that it can be read by a system
> call to unix.
>
> Using gsub I try:
>
>> gsub(" ","\\ ",path)
> [1] "/nfs/users/nfs_n/ns9/Phenotype Analysis/Results/Run_AmplRatio_neg
> BinaryAll trained without akapn+tnik.csv"
>
> Various variations on this result in either adding no backslashes, or two at
> once. How do I just get one backslash inserted?
You are probably being fooled by the print representation of backslashes in R
output:
> gsub("\\s","\\\\ ",path)
[1] "/nfs/users/nfs_n/ns9/\\ Phenotype\\ Analysis/Results/Run_AmplRatio_neg\\
BinaryAll\\ trained\\ without\\ akapn+tnik.csv"
To check for the presence of backslashes with grepl, you need an R-grep pattern
of "\\\\"
> grepl("\\\\", "\ ") # surprise? "\ " is not what it appears.
[1] FALSE
> grepl("\\\\", "\\ ")
[1] TRUE
> nchar("\ ")
[1] 1
> nchar("\\ ")
[1] 2
--
David Winsemius
Alameda, CA, USA
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