Compact one-shot basis labels: fixed (FX), at lower bound (LB), basic (BS), at upper bound (UB), free (FR), or generic nonbasic (NB).
FX
LB
BS
UB
FR
NB
Fixed variable/row whose lower and upper bounds coincide.
Nonbasic at the lower bound.
Basic variable or row slack.
Nonbasic at the upper bound.
Free item with no finite active bound.
Generic nonbasic item not represented by a bound-specific label.
Compact one-shot basis labels: fixed (
FX), at lower bound (LB), basic (BS), at upper bound (UB), free (FR), or generic nonbasic (NB).