Error message: missing value where logical needed
"Haynes, Maurice (NIH/NICHD)" wrote:
Dear all, I often import data sets from other programs that contain user defined missing values. As an example consider a variable MXPLOCO with a user defined missing value of as -9.
summary(MXPLOCO)
Min. 1st Qu. Median Mean 3rd Qu. Max. NA's -9.000 4.750 5.000 5.349 6.000 8.500 2.000 The following command successfully converts the value -9 to NA. However, an error message is also returned:
for(i in 1:length(MXPLOCO)) {
+ if(MXPLOCO[i] == c(-9, NA)) MXPLOCO[i] <- NA
+ }
Error in if (MXPLOCO[i] == c(-9, NA)) MXPLOCO[i] <- NA :
missing value where logical needed
summary(MXPLOCO)
Min. 1st Qu. Median Mean 3rd Qu. Max. NA's 4.00 5.00 5.00 5.54 6.00 8.50 3.00 What is the meaning of the error message, and how can I resolve the error? Thanks, Maurice
See ?NA on how to deal with NAs (specifically test on NAs [is.na()] and assignment of NAs [as well is.na(), in principle]). Examples: is.na(x) is.na(x) <- TRUE You can specify the NA character in read.table at once as in: read.table(my.file, na.string = -9) Uwe Ligges -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._