cmd - user input in R (Rscript and Widows command prompt) -

i trying figure out, how can run r script, using rscript in windows command prompt , ask user input.

so far, have found answers on how ask user input in r's interactive shell. effort in doing same readline() or scan() has failed.

example:

i have polynomial y=cx x can take more 1 values x1,x2,x3 , on. c variable know, need in order calculate value of y ask user xi values , store them somewhere inside script.

uinput <- function() {     message(prompt"enter x1 value here: ")     x <- readlines() } 

is way go? additional arguments? as.numeric help? how return x1? , implementation differ depending on os?

thanks.

that's general way go, implementation needs work: don't want readlines, want readline (yes, name similar. yes, dumb. r filled silly things ;).

what want like:

uiinput <- function(){      #ask user input     x <- readline(prompt = "enter x1 value: ")      #return     return(x) } 

you want error-handling there, though (i provide x1 value of false, or "turnip"), , type conversion, since readline returns one-entry character vector: numeric input provided should converted to, well, numeric input. nice, user-proof way of doing might be...

uiinput <- function(){      #ask user input     x <- readline(prompt = "enter x1 value: ")      #can converted?     x <- as.numeric(x)      #if can't, have problem     if(is.na(x)){           stop("the x1 value provided not valid. please provide number.")      }      #if can be, return - turn if if/else make more     #readable, wouldn't make difference in functionality since stop()     #means if if-condition met, return(x) never     #evaluated.     return(x) }