
Hi everyone,

I have been searching for answers for the following questions but I don't
have much success. The following questions may actually be quite simple. Any
help would be greatly appreciated.

(1) I have written a script which requires user input. I am using the
readline() command.However, everytime when I run the script, R does not wait
for the user input and proceed to the next line. Is there something like
par(ask=T) to solve this problem?

(2) In my script, I want it to stop running when a certain condition is met.
I have tried using the stop() function, but apparently R only stops reading
that line and start reading the following lines. I have also thought about
quit() but it is not quite what I want. May someone please lead me to the
right function please?

(3) When a minor error happens, I would like to get the user permission by
pressing the return key before the script continues to run. What function
should I be looking at?

Many thanks,
Chris
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