[R] using scan to record user's input

[Patrick Callier]

Silly question: Are you 'source'-ing this code or copying and pasting
it from somewhere?  I don't have any problems running your above
example on a PPC Mac with almost the same version of R (using
'source').

Here's my info:
R version 2.4.1 (2006-12-18)
powerpc-apple-darwin8.8.0

locale:
en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] "stats"     "graphics"  "grDevices" "utils"     "datasets"
"methods"   "base"

other attached packages:
      MASS KernSmooth
  "7.2-30"  "2.22-19"

Otherwise, I'm as stumped as you are.

On 3/11/07, Ken Knoblauch <knoblauch at lyon.inserm.fr> wrote:
> I'm using scan in a script to record a series of responses of the user as
> a function
> of some graphs that I put up on the screen.  A toy version would be,
>
> y <- rep(NA, 3)
> for (ix in seq( length(y) ) ) {
>         y[ix] <- scan( n = 1 )
>         }
>
> However, if I include any code after this loop, for example,
> y <- rep(NA, 3)
> for (ix in seq( length(y) ) ) {
>         y[ix] <- scan( n = 1 )
>         }
> y
>
> I get an error after I've entered my first number.
>
> 1: y
> 1: 3
> Error in scan(file, what, nmax, sep, dec, quote, skip, nlines, na.strings,  :
>         scan() expected 'a real', got 'y'
>
> scan seems to be trying to read the commands after the loop.  In the real
> case,
> the loop is longer and there are more commands after the loop.
> If I have more commands, I get the error right away, before the prompt to
> enter a number.
>
> I didn't see anything in the scan help that would allow me to circumvent
> this error.
>
> Can anyone suggest a way to get around this error.
>
> Thank you.
>
> Ken
>
> Here is my info
>
> sessionInfo()
> R version 2.4.1 Patched (2007-01-23 r40561)
> i386-apple-darwin8.8.1
>
> locale:
> C
>
> attached base packages:
> [1] "stats"     "graphics"  "grDevices" "utils"     "datasets"  "methods"
> [7] "base"
>
> other attached packages:
>     MASS
> "7.2-31"
>
>
> --
> Ken Knoblauch
> Inserm U846
> Institut Cellule Souche et Cerveau
> Département Neurosciences Intégratives
> 18 avenue du Doyen Lépine
> 69500 Bron
> France
> tel: +33 (0)4 72 91 34 77
> fax: +33 (0)4 72 91 34 61
> portable: +33 (0)6 84 10 64 10
> http://www.pizzerialesgemeaux.com/u846/
>
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