The term of each column (0 for the intercept, 1 for the first term).
Column names, such as "(Intercept)", "Ab", "Ab:Bq", "x".
R's factors attribute: one array per variable, one code per term (0 not in it, 1 contrasts, 2 indicators).
Whether the model has an intercept.
Degree of each term.
0-based indices of the rows of the data used (rows with a missing value are dropped).
Labels of the terms (variables joined by :).
The variables of the formula, the response first.
R's warnings.
The model matrix (array of rows).
Result of modelMatrix.