I want to combine all dataframes into one large list too... But each dataframe is a 35 columns x varying number of rows structure (from 2000 to >9000 rows) I have ~1500 dataframes of these to process, and that add up to > 1.5Gb of data...
Combining dataframes into a single one require me to transform each single dataframe into one line, but I really don't have a good solution for the varying number of rows scenario... And also, I don't want to stall my laptop every time I run the data set: maybe I can do that when my prof give me a ~ 4Gb ram desktop to run the script ;) Thanks! :) - John On Mon, Dec 8, 2008 at 1:36 PM, Greg Snow <[EMAIL PROTECTED]> wrote: > In the long run it will probably make your life much easier to read all the > dataframes into one large list (and have the names of the elements be what > your currently name the dataframes), then you can just use regular list > indexing (using [[]] rather than $ in most cases) instead of having to worry > about get and assign and the risks/subtleties involved in using those. > > Hope this helps, > > -- > Gregory (Greg) L. Snow Ph.D. > Statistical Data Center > Intermountain Healthcare > [EMAIL PROTECTED] > 801.408.8111 > > >> -----Original Message----- >> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] >> project.org] On Behalf Of tsunhin wong >> Sent: Monday, December 08, 2008 8:45 AM >> To: Jim Holtman >> Cc: r-help@r-project.org >> Subject: Re: [R] Transforming a string to a variable's name? help me >> newbie... >> >> Thanks Jim and All! >> >> It works: >> tmptrial <- trialcompute(trialextract( >> get(paste("t",tmptrialinfo[1,2],tmptrialinfo[1,16],".gz",sep="")) , >> tmptrialinfo[1,32],secs,sdm),secs,binsize) >> >> Can I use "assign" instead? How should it be coded then? >> >> Thanks! >> >> - John >> >> On Mon, Dec 8, 2008 at 10:40 AM, Jim Holtman <[EMAIL PROTECTED]> >> wrote: >> > ?get >> > >> > >> > Sent from my iPhone >> > >> > On Dec 8, 2008, at 7:11, "tsunhin wong" <[EMAIL PROTECTED]> wrote: >> > >> >> Dear all, >> >> >> >> I'm a newbie in R. >> >> I have a 45x2x2x8 design. >> >> A dataframe stores the metadata of trials. And each trial has its >> own >> >> data file: I used "read.table" to import every trial into R as a >> >> dataframe (variable). >> >> >> >> Now I dynamically ask R to retrieve trials that fit certain >> selection >> >> criteria, so I use "subset", e.g. >> >> tmptrialinfo <- subset(trialinfo, (Subject==24 & >> Filename=="v2msa8")) >> >> >> >> The name of the dataframe / variable of an individual trial can be >> >> obtained using: >> >> paste("t",tmptrialinfo[1,2],tmptrialinfo[1,16],".gz",sep="") >> >> Then I get a string: >> >> "t24v2msa8.gz" >> >> which is of the exact same name of the dataframe / variable of that >> >> trial, which is: >> >> t24v2msa8.gz >> >> >> >> Can somebody tell me how can I change that string (obtained from >> >> "paste()" above) to be a usable / manipulable variable name, so that >> I >> >> can do something, such as: >> >> (1) >> >> tmptrial <- trialcompute(trialextract( >> >> paste("t",tmptrialinfo[1,2],tmptrialinfo[1,16],".gz",sep="") >> >> ,tmptrialinfo[1,32],secs,sdm),secs,binsize) >> >> instead of hardcoding: >> >> (2) >> >> tmptrial <- >> >> >> trialcompute(trialextract(t24v2msa8.gz,tmptrialinfo[1,32],secs,sdm),sec >> s,binsize) >> >> >> >> Currently, 1) doesn't work... >> >> >> >> Thanks in advance for your help! >> >> >> >> Regards, >> >> >> >> John >> >> >> >> ______________________________________________ >> >> 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. > ______________________________________________ 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.
