Validates that a data.frame or matrix has at least n columns.
See also
Other structure checks:
require_dim(),
require_has_cols(),
require_length(),
require_length_matches(),
require_length_max(),
require_length_min(),
require_named(),
require_names(),
require_ncol_matches(),
require_nrow_matches(),
require_nrow_min(),
require_scalar(),
require_sorted(),
require_unique_names()