An example preference matrix for the multi-role workload allocation model. It can be used for either TA or GR preferences.
Format
## `multirole_prefmat_ex001` A matrix with 4 rows and 4 columns.
Rows correspond to individuals in `multirole_students_ex001`, and columns correspond to rows of `multirole_demand_ex001`.
Preference scores are encoded as 3 (first choice), 2 (second choice), and 1 (third choice). Unranked courses are encoded as -99.