Nothing

```
##
## Assemble the 1-dimensional (i.e., non-polynomial-expanded) model matrix
##
## ARGUMENTS:
## formula: model formula (of class "Formula")
## mf: model frame
##
## RETURN:
## model matrix (no intercept), with attributes "k_expand" telling how many
## columns should be included in the polynomial expansion and "k_lin"
## telling how many are included linearly
##
makeX <- function(formula, mf)
{
## Ensure no intercepts included
formula <- removeIntercepts(formula, mf)
## Extract the model matrix from the model frame
X <- model.matrix(formula, data = mf, rhs = 1)
k_expand <- ncol(X)
if (length(formula)[2] > 1)
X <- cbind(X, model.matrix(formula, data = mf, rhs = 2))
k_lin <- ncol(X) - k_expand
binary_cols <- apply(X, 2, function(a) all(a %in% 0:1))
structure(X,
k_expand = k_expand,
k_lin = k_lin,
binary_cols = binary_cols)
}
```

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