replace NA
Hi, If your geology map is a special kind of object, this may not work, but if you are just dealing with a data frame or matrix type object named, "geology" with columns, something like this ought to do the trick: geology[is.na(geology[, "landform"]), "landform"] <- 0 ?is.na returns a logical vector of TRUE/FALSE whether a value is missing which is used to index the data and then 0 is assigned to all those positions. HTH, Josh
On Fri, May 6, 2011 at 1:12 PM, azam jaafari <azamjaafari at yahoo.com> wrote:
Hello all I have a geology map that has three level, bellow <-geology lithology??? landscape?? landform landform level is used as covariate (with codes=1,2,3,4,5) for training of neural network,?but this level has missing data as NA. I want to replace?the missing data of landform level with 0?(zero). Finally, landform will have codes ?0,1,2,3,4,5. please help me Thanks alot. ? ? ? ?[[alternative HTML version deleted]]
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Joshua Wiley Ph.D. Student, Health Psychology University of California, Los Angeles http://www.joshuawiley.com/