[R] Locate first index

[Cezar Augusto de Freitas Anselmo]

Hi, all. I'd like to know if exists a manner to get the first index where
a condition is attained in a vector. For example,

There is a better solution than 

first.index <- table(subject[corretor==27])[1]

(give me the subject for the first time that corretor is 27)?

Thanks,

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Cezar Freitas (ICQ 109128967)
IMECC - UNICAMP
Campinas, SP - Brasil