How to Convert List to Numeric in R

To convert a list to a numeric value in R, combine the “unlist()” function and the “as.numeric()” function. The “unlist()” function produces a vector that contains all the atomic components. The as.numeric() function returns a numeric value or converts any value to a numeric value.




data: It is the data is the list consisting of vectors.


rv1 <- 1:5
rv2 <- 6:10

Then, use the list() function to create a vector list.

rv1 <- 1:5
rv2 <- 6:10

data <- list(rv1, rv2)


[1] 1 2 3 4 5

[1] 6 7 8 9 10

Finally, use the unlist() and as.numeric() function to convert a list to a numeric value.

rv1 <- 1:5
rv2 <- 6:10

data <- list(rv1, rv2)

num <- as.numeric(unlist(data))


 [1] 1 2 3 4 5 6 7 8 9 10

You can see that the final output is a numeric value, and to check its data type, use the typeof() function.


It will give us the double as an output, meaning it’s a numeric value. The numeric data type is identical to double (and real ). It creates a double-precision vector of the specified length, with each element equal to 0.

If the values are of type factor, you should convert them using the following code snippet.


That’s it.

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