[R] vector of NA indices

[Martin Maechler]

    PBM> I have a vector Pes with 600 elements some of which are NA's. How can I
    PBM> form a vector of the indices of the NA's.

    PBM> for(i in 1:600) if(is.na(Pes[i])) print(i)

    PBM> prints the indices of the NA's but I can't figure out how to put the
    PBM> results in a vector.

which(is.na(Pes))

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