Create the leaves of an expression graph. A variable is a slice of the
differentiation vector; a parameter is fixed data that can be updated between
evaluations (see sd_register_params).
Arguments
- d1, d2
row and column dimensions of the leaf.
- var_id
0-based flat (column-major) offset of this variable's first entry within the primal vector
u.- param_id
0-based parameter offset, analogous to
var_id.- n_vars
total number of variables in the problem.
- values
numeric data for the parameter (length
d1 * d2, column-major).