for(j in 1:length(link$http)){
url<-c(as.character(link$http[j]))
filename<-paste0("result/",link$type[j],link$date[j],".txt")
download.file(url,destfile=filename)
}
报错:Error in download.file(url, destfile = filename) :
cannot open destfile 'result/PRS1601.txt', reason 'No such file or directory'
跪求大神指导