Using R, how can I write the following logic into the dataframe: IF column A = B and Column E = 0, delete row
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The answer is
Logic index:
d<-d[!(d$A=="B" & d$E==0),]
Use the which function:
A <- c('a','a','b','b','b')
B <- c(1,0,1,1,0)
d <- data.frame(A, B)
r <- with(d, which(B==0, arr.ind=TRUE))
newd <- d[-r, ]
Subset is your safest and easiest answer.
subset(dataframe, A==B & E!=0)
Real data example with mtcars
subset(mtcars, cyl==6 & am!=0)
Source: Stackoverflow.com