The problem is relatively simple. You have

team_seed <- data.frame() team_seed <- cbind(playoff_teams, seed_col, BPI_col) head(team_seed$seed_col)

If we break this down you’ll see the problem:

- You create an empty data frame and assign it to the object
`team_seed`

- You create a
**matrix**by column-binding the vectors`playoff_teams`

,`seed_col`

, and`BPI_col`

. - You
**assign**this matrix to the object`team_seed`

, thus obliterating the empty data frame you created in the first line. R just overwrote it. - You then try to
`head()`

a component of`team_seed`

but R rightly complains that this is an atomic vector (a matrix is a vector with a`dim`

attribute)

What you want is some variation on:

team_seed <- data.frame(playoff_teams, seed_col, BPI_col)

there is no reason to allocate the empty data frame. If you do that, then you need to fill in the data frame, not overwrite it.

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