R help - Jun 2008 - creating a dataframe using a list of the variable names

Hello,

I'm fairly new to R, and despite spending quite some time exploring,
testing, and looking for answers, I still have a couple of questions
remaining...

The first one is about creating a dataframe using a list of the variable names .

I get this output file from a database:

BOB <- c('A/A', 'C/C', '15/27')
MARY <- c('A/A', NA, '13/12')
JOHN <- c('A/A', 'C/A', '154/35')
CLIFF <- c('A/C', 'C/C', '15/12')
PAM <- c('A/C', 'C/A', '13/12')

sampleList <- c("BOB", "MARY", "JOHN",
"CLIFF", "PAM")
polyList <- c("rs123", "rs124", "rs555")

to create a dataframe with the data I use:

data.raw <- data.frame(BOB, MARY, JOHN, CLIFF, PAM, row.names=polyList)

which works fine, but when there are several hundreds samples... well, you guess
my problem.

I'd like to create the dataframe using the list of the variables, contained
in sampleList - i.e. something like data.frame(function(sampleList),
row.names=polyList)

Is that possible, and if yes, how?

Thanks in advance,

Stephane

Does this do what you want:
> BOB <- c('A/A', 'C/C', '15/27')
> MARY <- c('A/A', NA, '13/12')
> JOHN <- c('A/A', 'C/A', '154/35')
> CLIFF <- c('A/C', 'C/C', '15/12')
> PAM <- c('A/C', 'C/A', '13/12')
> sampleList <- c("BOB", "MARY", "JOHN",
"CLIFF", "PAM")
> polyList <- c("rs123", "rs124", "rs555")
> x <- do.call(data.frame, lapply(sampleList, get))
> names(x) <- sampleList
> row.names(x) <- polyList
> x
        BOB  MARY   JOHN CLIFF   PAM
rs123   A/A   A/A    A/A   A/C   A/C
rs124   C/C  <NA>    C/A   C/C   C/A
rs555 15/27 13/12 154/35 15/12 13/12
>

On Sun, Jun 29, 2008 at 3:50 AM, Stephane Bourgeois <sb20 at sanger.ac.uk>
wrote:
> Hello,
>
> I'm fairly new to R, and despite spending quite some time exploring,
testing, and looking for answers, I still have a couple of questions
remaining...
>
> The first one is about creating a dataframe using a list of the variable
names .
>
> I get this output file from a database:
>
> BOB <- c('A/A', 'C/C', '15/27')
> MARY <- c('A/A', NA, '13/12')
> JOHN <- c('A/A', 'C/A', '154/35')
> CLIFF <- c('A/C', 'C/C', '15/12')
> PAM <- c('A/C', 'C/A', '13/12')
>
> sampleList <- c("BOB", "MARY", "JOHN",
"CLIFF", "PAM")
> polyList <- c("rs123", "rs124", "rs555")
>
> to create a dataframe with the data I use:
>
> data.raw <- data.frame(BOB, MARY, JOHN, CLIFF, PAM, row.names=polyList)
>
> which works fine, but when there are several hundreds samples... well, you
guess my problem.
>
> I'd like to create the dataframe using the list of the variables,
contained in sampleList - i.e. something like data.frame(function(sampleList),
row.names=polyList)
>
> Is that possible, and if yes, how?
>
> Thanks in advance,
>
> Stephane
>
> ______________________________________________
> 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.
>
>


-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?