rGathering column values into a

r - Gathering column values into a single column with variable name - Stack Overflow
I have this simple data frame,var_1 <- c(10, 5, 6, 0)var_2 <- c(0, 0, 3, 0)var_3 <- c(2, 0,
rGathering column values into a single column with variable nameStack Overflow
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