On 01-02-2012, at 16:55, Chris82 wrote:
> Hi R users,
>
> is there any possibilty that a while loop is working like that:
>
> z <- c(0,1,2,3,4,5,6,7,8,9)
> r <- 7
>
> while(w == T) {
> for ( i in 1:10 ){
> w <- r == z[i]
> print(w)
> }
> }
>
>
> The loop should stop if w == TRUE
1. This won't work since the variable w doesn't exist at the start of the while
loop.
2. The while loop condition is incorrect: it should be while( w == FALSE)
3. Don't use T and F. Use TRUE and FALSE.
4. If there is no element of z equal to r the loop will run forever (with the
correct condition of course).
A much better way of doing what you seem to be wanting is
which(z == r)
or possibly
any(z == r)
Berend
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