TYPE
variable ;
CONTYPE
variable ;
The TYPE list, which is optional, names the variable that has as values keywords that indicate either the constraint type
for each constraint or the type of special rows in the CONDATA= data set. The values of the TYPE list variable also indicate, in each observation of the CONDATA= data set, how values of the VAR or COEF list variables are to be interpreted and how the type of each constraint or special row name is determined. If the TYPE list
is not specified, the CONDATA= data set is searched and a SAS variable with the name _TYPE_
is used. Valid keywords for the TYPE variable are given below. If there is no TYPE statement and no other method is used
to furnish type information (see the DEFCONTYPE= option), all constraints are assumed to be of the type “less than or equal to” and no special rows are used. The TYPE list variable must have character values and can be used when the data in the CONDATA= data set is in either the sparse or the dense format. If the TYPE list variable value has a * as its first character, the observation is ignored because it is a comment
observation.
The following are valid TYPE list variable values. The letters in boldface denote the characters that PROC NETFLOW uses to determine what type the value suggests. You need to have at least these characters. In the following list, the minimal TYPE list variable values have additional characters to aid you in remembering these values.
< 
less than or equal to () 
= 
equal to (=) 
> 
greater than or equal to () 
CAPAC 
capacity 
cost 

equal to 

free row (used only for linear programs solved by interior point) 

gain in arc flow (generalized networks) 

greater than or equal to 

less than or equal to 

loss in arc flow (generalized networks) 

lower flow or value bound 

lower flow or value bound 

maximize (opposite of cost) 

minimize (same as cost) 

value of arc multiplier (generalized networks) 

objective function (same as cost) 

rhs of constraint 

type of constraint 

reserved for future use 

unrestricted variable (used only for linear programs solved by interior point) 

upper value bound or capacity; second letter must not be N 

The valid TYPE list variable values in function order are
LE less than or equal to ()
EQ equal to (=)
GE greater than or equal to ()
COST MINIMIZE MAXIMIZE OBJECTIVE cost or objective function coefficient
CAPAC UPPER capacity or upper value bound
LOWERBD LOWblank lower flow or value bound
RHS rhs of constraint
TYPE type of constraint
MULT GAIN LOSS value of arc multiplier in a generalized network
A TYPE list variable value that has the first character causes the observation to be treated as a comment. If the first character is a negative sign, then is the type. If the first character is a zero, then is the type. If the first character is a positive number, then is the type.