A better name is formula. I'll leave A as an optional named argument for backward compatibility.
paramter
description
A
a formula. In mat and singvals, only the right-hand side is used.
data
a data frame from which to pull out numerical values for the variables in the formulamat returns a model matrixTo demonstrate singularity, use singvals.
A better name is
formula
. I'll leaveA
as an optional named argument for backward compatibility.