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problem.addGenCons

Purpose
Adds one or more general constraints to the problem. Each general constraint y = f(x1, ..., xn, c1, ..., cn) consists of one or more (input) columns xi, zero or more constant values ci and a resultant (output column) y, different from all xi. General constraints include maximum and minimum (arbitrary number of input columns of any type and arbitrary number of input values, at least one total), and and or (at least one binary input column, no constant values, binary resultant) and absolute value (exactly one input column of arbitrary type, no constant values).
Topic areas
Problem Creation, Piecewise Linear and General Constraints
Synopsis
problem.addGenCons(contype, resultant, colstart, colind, valstart, val)
Arguments
contype 
Integer array containing the types of the general constraints:
xpress.GenConsType.MAX (0) 
indicates a maximum constraint;
xpress.GenConsType.MIN (1) 
indicates a minimum constraint;
xpress.GenConsType.AND (2) 
indicates an and constraint.
xpress.GenConsType.OR (3) 
indicates an or constraint;
xpress.GenConsType.ABS (4) 
indicates an absolute value constraint.
resultant 
Integer array containing the indices of the output variables of the general constraints.
colstart 
Integer array containing the start index of each general constraint in the colind array.
colind 
Integer array containing the input variables in all general constraints.
valstart 
Integer array containing the start index of each general constraint in the val array (may be None).
val 
Double array containing the constant values in all general constraints (may be None).
Related controls
Integer
GENCONSDUALREDUCTIONS 
Controls whether dual reductions may be applied to reduce the number of added variables and constraints.

Further information
1. General constraints must be set up before solving the problem. They are converted to additional binary variables, indicator and linear constraints with the exact formulation and number of added entities depending on the performed presolving.
2. Note that using non-binary variables in and/ or constraints or adding constant values to them or absolute value constraints will give an error at solve time.
3. This function cannot be called while the current problem is being solved or when it is in an interrupted state. Use problem.postSolve to restore the problem to a non-solving state.
4. Arguments resultant, colind may contain xpress.var objects instead of indices.
Related topics
problem.getGenCons, problem.delGenCons.

Parent Topic Methods of the class problem

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