Using rbind correctly

Question

For reasons not relevant, let's assume I want to use rbind like so:

df.new = rbind(df.old, c(1, 2, 1, 1)

BUT, the issue is that df.new has 5 columns, not 4. I want to leave the last field blank by design. Is this possible using rbind?

Answer 1

Use NA as a placeholder in the columns you want to leave blank:

df.new = rbind(df.old, c(1, 2, 1, 1, NA))