list2df {qrqc} | R Documentation |
list2df
is a helper function that takes a named list and
applies a function to each element, and combines the resulting data
frames into a single data frame. The output data frame will have an
additional column named sample
indicating which element the
data came from.
list2df(x, fun)
x |
a named list of objects. |
fun |
a function that takes in the elements of |
A data frame made by applying fun
to each element of the list
x
. An additional column named sample
will indicate which
element the data came from.
Vince Buffalo <vsbuffalo@ucdavis.edu>
## Get some sequence files sq.files = list.files(system.file('extdata', package='qrqc'), pattern="test.*fastq", full.names=TRUE) names(sq.files) <- gsub("(.*)\\.fastq", "\1", basename(sq.files)) sq <- lapply(sq.files, readSeqFile) ## Take the FASTQSummary objects, extract quality data from each of ## the, and combine. d <- list2df(sq, getQual) ## Look at difference in average quality aggregate(d$mean, list(sample=d$sample), mean) ## Look at difference in variance - this is where we really see a ## change. aggregate(d$mean, list(sample=d$sample), var)