You do not tell us what you are trying to do but I think there is something wrong in the logic of your thinking as on the one hand you are selecting just precisely those elements of data$Rain which are NA and then testing whether any of them equals 60.

On 25/11/2014 12:19, Frederic Ntirenganya wrote:
Dear All,

I am getting this error and don't know why it comes. can you please help ?

Error in if (data$Rain[i_NA] == 60) { :
   missing value where TRUE/FALSE needed

The loop is :

indicNAs <- which(data$Rain %in% NA)
   ind_nonleap = c() # NAs due to non leap years
   ind_nonrecord = c() # NAs due to non recording values
   for (i_NA in indicNAs ){
     if(data$Rain[i_NA] == 60){
       ind_nonleap <- append(ind_nonleap,i_NA)
     }
     else {
       ind_nonrecord<-append(ind_nonrecord,i_NA)
     }
    #cat(ind_nonrecord)
    #cat( ind_nonleap)
   }
   ind_nonleap

Regards,
Frederic.

Frederic Ntirenganya
Maseno University,
African Maths Initiative,
Kenya.
Mobile:(+254)718492836
Email: fr...@aims.ac.za
https://sites.google.com/a/aims.ac.za/fredo/

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