Remove rows when cells are equal [duplicate]

Answer 1

For large dataset you can use data.table:

library(data.table)
setDT(df)[Gen1!=Gen2,]

Answer 2

We can use subset

subset(df, Gen1!=Gen2)

Or filter from tidyverse

library(tidyverse)
df %>% 
    filter(Gen1 != Gen2)

data

df[1:2] <- lapply(df[1:2], as.character)