Here is how to get the information from the file name that you want:
> # let's assume you have the filename
> fileName <- "G7_pig328_unit328_Site141_30MAR2012_RNo4_SitNo1.csv"
> # parse it for the group and bird names
> group <- sub("^G([0-9]+).*", "\\1", fileName)
> bird <- sub(".*pig([0-9]+).*", "\\1", fileName)
> group
[1] "7"
> bird
[1] "328"
>
>
On Wed, Nov 28, 2012 at 7:40 AM, arun <smartpink...@yahoo.com> wrote:
> Hi,
> TRy this:
> dat1 <- read.table(text="
> Date_ Time_ Speed Course Type_ Distance
> 30/03/2012 11:15:05 108 121 -2 0
> 30/03/2012 11:15:06 0 79 0 0
> 30/03/2012 11:15:07 0 76 0 1
> 30/03/2012 11:15:08 0 86 0 2
> 30/03/2012 11:15:09 0 77 0 3
> ", header = TRUE, stringsAsFactors = FALSE)
> fileN <- "G7_pig328_unit328_Site141_30MAR2012_RNo4_SitNo1.csv"
> dat1$cDistance<-cumsum(dat1$Distance)
>
> dat1$Group<-as.numeric(unlist(strsplit(gsub("^\\D+(\\d+)\\D+(\\d+).*","\\1
> \\2",fileN)," ")))[1]
> dat1$BIRD<-as.numeric(unlist(strsplit(gsub("^\\D+(\\d+)\\D+(\\d+).*","\\1
> \\2",fileN)," ")))[2]
> dat1
> A.K.
>
>
>
> ----- Original Message -----
> From: jgui001 <j.guilb...@auckland.ac.nz>
> To: r-help@r-project.org
> Cc:
> Sent: Wednesday, November 28, 2012 4:33 AM
> Subject: [R] data frame: adding columns from data and file title
>
> Data processing”
>
> I have a large number of csv files from animal tracks that look like this:
>
> Date_ Time_
> Speed
> Course Type_
> Distance
> 30/03/2012 11:15:05 108
> 121 -2
> 0
> 30/03/2012 11:15:06 0
> 79 0
> 0
> 30/03/2012 11:15:07 > 0
> 76 0
> 1
> 30/03/2012 11:15:08 > 0
> 86 0
> 2
> 30/03/2012 11:15:09 > 0
> 77 0
> 3
>
> Each file has a name like this
> “G7_pig328_unit328_Site141_30MAR2012_RNo4_SitNo1.csv”
>
> To automate the processing I would like to
> 1. Add on various columns calculated from within the data frame e.g.
> cumulative distance traveled (cDistance) by Summing the distance column from
> [1 :n] for each row
> 2 Add columns derived from the file name so when I merge all the files
> together I know what observation corresponds to which group and bird etc.
> For example G7 stands for group 7, pig328 is pigeon328:
>
> The file look the same with but with these columns (plus others) added
>
> cDistance Group BIRD
> 0 7 328
> 0 7 328
> 1 7 328
> 3 7 328
> 6 7 328
>
> I was thinking a function like this for cDistance (if I can get it to work)
>
> cdistamce <-funtion(x){
> i = 1
> j=nrow(temp1.df)
> while(i<=j,ifelse(i=1,"Distance[i]",Sum("Distance"))
> i=i+1
> }
>
> But hit a brick wall and I have no idea about adding columns from the name.
> Am I on the right track with the first one and any ideas, coz I can't brain
> today I have the dumb!?
>
> Cheers
> Josh
>
>
>
> --
> View this message in context:
> http://r.789695.n4.nabble.com/data-frame-adding-columns-from-data-and-file-title-tp4651099.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help@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.
>
>
> ______________________________________________
> R-help@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.
--
Jim Holtman
Data Munger Guru
What is the problem that you are trying to solve?
Tell me what you want to do, not how you want to do it.
______________________________________________
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and provide commented, minimal, self-contained, reproducible code.
