An `nrow(df)`-by-`p` matrix `var` is encoded in
data frame `df` with the columns `var.1`,...,`var.p` or
`var1`,...,`varp`.
Usage
md_decode_matrix(df, var)
Arguments
df
data frame that contains the matrix
var
the symbolic name of the matrix
Value
a matrix
Details
A matrix will be returned with the appropriate ordering denoted by the
index, e.g., `a.2` will come before `a.4`. There should be no
gaps in the matrix indexes, e.g., if there is `a.4` then there must
also be `a.1,a.2,a.3`.