if statement - how to fix error "missing value where TRUE/FALSE needed" at R? -

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my code :

for(k in 1:length(dat)){    if(dat==boxplot(dat)$out[k]){       dat<-na    } }

and result 

error in if (dat == boxplot(dat)$out[k]) { :    missing value true/false needed

how fix it?

could 1 of 2 things; fix specific error 

for(k in 1:length(dat)){         if(length(boxplot(dat)$out ) & dat==boxplot(dat)$out[k]){           dat<-na         }       }

but that's clunky r code. better might be:

dat[ dat %in% boxplot(dat)$out ] <- na

(it is, however, statistical malpractice remove outliers.)


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