Filling an empty information box in R
I used the search box for this and found similar questions , but not identical. This seems to be a tricky issue though (I'm R-newbee).
I am just trying to create a new dataframe and add values to it. Unsurprisingly, R throws an error saying the strings do not match.
Here's the code
d <- data.frame()
files <- list.files(pattern="*.lst", full.names=T, recursive=FALSE)
d$fileName <- lapply(files, basename)
d$node <- gsub("([^.]+)\.[^\.lst]+\.lst", "$1", d$fileName, perl=TRUE)
And here's the mistake
Error in
$<-.data.frame
(*tmp*
, "fileName", value = ("A-bom.WR-PEA.lst",: replacement has 337 lines, data 0
How can I solve this problem? I was thinking about filling with d
the same number of lines as files, but I don't think this is the best way?
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Just create your dataframe when it used the first time, so you don't add rows to the dataframe with zero rows. And you can use sapply
to return a vector (named) instead of a list.
files <- list.files(pattern="*.lst", full.names=T, recursive=FALSE)
d <- data.frame(fileName = unname(sapply(files, basename)))
d$node <- gsub("([^.]+)\\.[^\\.lst]+\\.lst", "$1", d$fileName, perl=TRUE)
Your regex caused an error, however, I'm not familiar with regex, so you may need to fix my corrections; -)
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