[R] a vector unusually getting NA values.....

[akshay kulkarni]

dear members,

                             I have a function by name "ygcudf" and a list of stock names by name"snl" ( of class "list"). ygcudf acts on snl and returns a list of the most favourable  stocks. I don't wish to divulge the code of the function, for genuine reasons, but the algorithm is as follows:

        {

        k <- 1; i <- 1



       for(j in 1:length(snl)){

                                 if(snl[[j]] == "condition") {

                                       k[i] <- j

                                        i <- i+1}

                                             }

        snlf1 <- snl[k]

        return(snlf1)

}


The problem is, if we test the function by returning the vector k, it, (k), is getting NA values. i.e, instead of skipping the values of j for which the condition is false, k is getting populated by NA values. k is getting the following values (for a given snl):

        k

[1]    1 NA NA NA 5 6 NA NA 9 10 11 NA NA NA NA 16


If j is initialised to the values for which k is NA, and the function is  made to return j, it is returning the relevant j. I don't know how the k is getting NA values. Will the following change work:

      snlf1 <-  snl[na.omit(k)]


What is wrong ??


Sorry for not parting with the code...please bear with me....

your help will be highly appreciated


yours sincerely,

AKSHAY M KULKARNI

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