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problem.addCols

Purpose
Adds columns to the optimizer matrix.
Topic areas
Problem Creation, Optimizer
Synopsis
problem.addCols(objcoef=None, start=None, rowind=None, rowcoef=None, lb=None, ub=None)
Arguments
objcoef 
Double array containing the objective function coefficients of the new columns. As of version 43 this can be None to indicate that all newly created variables have an objective coefficient of 0 (zero).
start 
Integer array containing the offsets in the rowind and rowcoef arrays of the start of the elements for each column. May be None if none of the columns contain nonzero coefficients.
rowind 
Integer array containing the row indices for the elements in each column. May be None if none of the columns contain nonzero coefficients.
rowcoef 
Double array containing the element values. May be None if none of the columns contain nonzero coefficients.
lb 
Double array containing the lower bounds on the added columns. This can be None in which case all variables will have a lower bound of 0.
ub 
Double array containing the upper bounds on the added columns. This can be None in which case all variables will have an infinite upper bound.
Related controls
Integer
EXTRACOLS 
Number of extra columns to be allowed for.
EXTRAELEMS 
Number of extra matrix elements to be allowed for.
EXTRAMIPENTS 
Number of extra MIP entities to be allowed for.

Double
MATRIXTOL 
Tolerance on matrix elements.

Further information
1. The double constants xpress.infinity and -xpress.infinity defined in the library header file can be used to represent plus and minus infinity respectively in the bound arrays.
2. If the columns are added to a MIP problem then they will be continuous variables. Use problem.chgColType to impose integrality conditions on such new columns.
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. Argument rowind may contain xpress.constraint objects instead of indices.
Related topics
problem.addNames, problem.addRows, problem.delCols, problem.chgColType.

Parent Topic Methods of the class problem

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