[R] How to get an argument dynamically from a list?

From: Stephane Bourgeois <sb20_at_sanger.ac.uk>
Date: Sun, 29 Jun 2008 12:24:16 +0000 (UT)
('binary' encoding is not supported, stored as-is) ('binary' encoding is not supported, stored as-is)
Hi,

I'd like to get an argument (I think it's the right term) dynamically from a list, but cannot manage to do it.

Here is the code I use:

#output given by 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")

#make dataframe with data

data.raw <- data.frame(t(do.call(data.frame, lapply(sampleList, get)))) names(data.raw) <- polyList
row.names(data.raw) <- sampleList

I want to get, for example, data.raw$rs124 using polyList.

I tried

> get(paste("data.raw$", polyList[2], sep=""))
Error in get(paste("data.raw$", polyList[2], sep = "")) :   variable "data.raw$rs124" was not found   

but it's obviously not the right way, data.raw$rs124 not being a variable per se.

Any idea about how I could do that?

Thanks,

Stephane



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