[R] Readline - wait for user input

From: Forest Floor <jrg66_at_comcast.net>
Date: Wed, 23 May 2007 10:06:09 -0400


Hi,

I've seen various posts on this question, but still can't get the code right.

If I run the following code one line at a time, it works fine. If I run it together as a block, however, it doesn't wait for the input and gives an error.

There must be a way to have are pause/wait for an answer, but I can't seem to find it. Thanks! J

Code:

choosefunction <- function(){readline("1. linear, 2. linear with lag, 3. nonlinear ")}
ans <- as.integer(choosefunction())

if (ans==1){K2=x1}
if (ans==2){K2=x2 }
if (ans==3){K2=x3 }

ans

Error text:
> ans <- as.integer(choosefunction())

1. linear, 2. linear with lag, 3. nonlinear if (ans==1) {K2=x1}]} Warning message:
NAs introduced by coercion
> if (ans==2){K2=x2) }

Error in if (ans == 2) { : missing value where TRUE/FALSE needed

> if (ans==3){K2=x3}

Error in if (ans == 3) { : missing value where TRUE/FALSE needed
> ans

[1] NA

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