Hi R users
I am trying to find unmatched data from two dataframes. I would like to
find unmatched data based on several factors. For the following data:
dat1 <- data.frame(x = paste("A", 1:6, sep=""),
y = c("andy","bob","ciaran","dan", "eion",
"fred"))
dat1
dat2 <- data.frame(x = paste("A", c(1,2,3,5,6), sep=""),
y = c("andy", "bob", "ciaran",
"dan", "zane"),z=c(10,20,30,40,50))
dat2
I would like to know data that from dat2 that doesn't appear in dat1
based on both the x and y factors ie (A5, dan, 40) and (A6,zane, 50).
I have tried two approaches but have not been successful
? nomatch <- subset(dat1, is.element(?) == FALSE)
? setdiff(dat1$x,dat2$y)
Any thoughts would be great
Regards
Andy
Andrew McFadden MVS BVSc
Incursion Investigator
Investigation & Diagnostic Centres - Wallaceville Biosecurity New
Zealand Ministry of Agriculture and Forestry
Phone 04 894 5600 Fax 04 894 4973 Mobile 029 894 5611 Postal address:
Investigation and Diagnostic Centre- Wallaceville Box 40742 Ward St
Upper Hutt
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