Get or set a Variable's sample_bounds -- a
(low, high) region used to draw random initial points in
best_of NLP solves (psolve(prob, nlp = TRUE, best_of = n)).
When set, it overrides the variable's value during random initialization;
when NULL (the default) finite variable bounds are used instead.
Supply a pair c(low, high) (scalars broadcast to the variable shape)
or a list(low, high) of per-entry vectors; set NULL to clear.
sample_bounds(x, ...)sample_bounds(x) <- value
sample_bounds(x) returns the stored list(low, high)
or NULL; the setter returns the modified variable.
A Variable.
Not used.
A (low, high) pair, or NULL to clear.