How to convert dataframe to matrix without column names

Question

I would like to convert a dataframe into a numeric-only matrix. My goal:

num [1:3, 1:4] 1 2 3 1 2 3 1 2 3 1 ...

And that's all.

alpha <- beta <- gamma <- delta <- c(1,2,3)
df <- data.frame(alpha, beta, gamma, delta, stringsAsFactors = FALSE)

M1 <- as.matrix(df, ncol = ncol(df))
str(M1)

M2 <- data.matrix(df)
str(M2)

num [1:3, 1:4] 1 2 3 1 2 3 1 2 3 1 ... - attr(*, "dimnames")=List of 2
..$ : NULL
..$ : chr [1:4] "alpha" "beta" "gamma" "delta"

I can't for the life of me figure out how to do it without all the attributes. I need the pure form as input to another method.

Answer 1

@thelatemail was absolutely right.

unname(as.matrix(df))

Does the trick.