[R] Find the first values in vector

[Grzes]

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
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