[R] vector of NA indices

[Friedrich Leisch]

>>>>> On Wed, 14 Jul 1999 04:09:21,
>>>>> Peter B Mandeville (PBM) wrote:

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.

try this:

x <- (1:length(Pes))[is.na(Pes)]


.fritz

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