Nothing
as.best <-
function(x,...)UseMethod('as.best')
as.best.data.frame <- function(x,...){
for(col in names(x)){
tryCatch(
x[[col]] <- as.best(x[[col]],...),
error = function(e) stop('in column ',col,': ',e$message)
)
}
x
}
as.best.default <-
function(x,prefix='#',na.strings=c('.','NA',''),...){
stopifnot(length(prefix)<=1)
x <- as.character(x)
x <- sub('^\\s*','',x)
x <- sub('\\s*$','',x)
x[x %in% na.strings] <- NA
y <- suppressWarnings(as.numeric(x))
newNA <- !is.na(x) & is.na(y)
if(all(is.na(y)))return(x) # nothing converted to numeric
if(!any(newNA))return(y) # no loss on conversion to numeric
if(!length(prefix))stop('character values mixed with numeric, e.g. ', x[newNA][[1]])
# If we reached here, x has some values coercible to numeric and some not, maybe some NA.
# Numeric values buried in a character vector are ambiguous
x[!is.na(y)] <- glue(prefix,x[!is.na(y)])
return(x)
}
#as.best.comment <- function(x,...)as.character(x)
#as.best.timepoint <- function(x,...)as.character(x)
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