[R] problem in my code
Gabor Grothendieck
ggrothendieck at gmail.com
Mon Jul 10 06:55:08 CEST 2006
The problem can be reduced to this:
x <- 1
x[1] <<- 2 # error
The following are ok:
x <- 1
x[1] <- 3
x <- 1
x <- 4
x <- 1
x <<- 5
Does anyone know why? Is this a bug in <<- ?
On 7/9/06, Taka Matzmoto <sell_mirage_ne at hotmail.com> wrote:
> Dear R-users
>
> I wrote a small program for assigning a membership
>
> Here is my script
>
> sample.size <- 60
>
> x <- rnorm(sample.size, 0, 1)
> y <- rnorm(sample.size, 0, 1)
>
> x.mean <- mean(x)
> y.mean <- mean(y)
> membership <- numeric(sample.size)
>
> for (i in 1:sample.size)
> {
> if ((x[i] < x.mean) && (y[i] < y.mean))
> {
> membership[i] <<- 1
> } else {
> if ((x[i] > x.mean) && (y[i] < y.mean))
> {
> membership[i] <<- 2
> } else {
> if ((x[i] > x.mean) && (y[i] >
> y.mean))
> {
> membership[i] <<- 3
> } else
> {
> membership[i] <<- 4
> }
> }
>
> }
>
> }
> cbind(x,y,membership)
>
> There is an error message
> "Error: object "membership" not found"
> I can't figure it out.
>
> Any help or advice on improvement for this code will be appreciated.
> I konw this code is not well written at all.
>
> Thank you
>
> Taka
>
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