On Nov 9, 2009, at 1:44 PM, Grzes wrote:
Hi !
I have a vector:
vec= TRUE TRUE TRUE TRUE FALSE FALSE FALSE FALSE TRUE TRUE FALSE
and I'm looking for a method which let me get only the first values
equal
TRUE from this vector. It means that I want to get a vector:
vec_out = TRUE TRUE TRUE TRUE
or posictions values = TRUE: vec_out = 1,2,3,4
?rle
> vec[ 1:rle(vec)$lengths[1] ]
[1] "TRUE" "TRUE" "TRUE" "TRUE"
Although that approach would faid if the first element were "FALSE".
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