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didchange
2012 Feb 06
5
I bet apply has a solution
...#Create data
Data..<-data.frame(a=rep(1,10),b=c(rep(1,9),2),c=c(rep(1,8),2,2))
a b c
1 1 1 1
2 1 1 1
3 1 1 1
4 1 1 1
5 1 1 1
6 1 1 1
7 1 1 1
8 1 1 1
9 1 1 2
10 1 2 2
So what I want is to return logical value telling me if all the values are
the same. So the result would be a b c DidChange
1 1 1 1 FALSE
2 1 1 1 FALSE
3 1 1 1 FALSE
4 1 1 1 FALSE
5 1 1 1 FALSE
6 1 1 1 FALSE
7 1 1 1 FALSE
8 1 1 1 FALSE
9 1 1 2 TRUE
10 1 2 2 TRUE
I bet apply could handle this elegantly but that family of functions is
still not 100% intuitive to me. Th...