##Function to source(x) if x is given, or source(last x given) otherwise
##Last x is stored in options() last.source. x is unquoted with .s omitted.
##Author: Frank Harrell 19May91
src <- function(x) {
if(!missing(x)) {
y <- paste(as.character(substitute(x)),".s",sep="")
options(last.source=y, TEMPORARY=FALSE)
}
else y <- options()$last.source
if(is.null(y))
stop("src not called with file name earlier")
source(y)
cat(y, "loaded\n")
invisible()
}
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