Populating the Problem Object

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The problem object instantiated by CPXcreateprob represents an empty problem that contains no data; it has zero constraints, zero variables, and an empty constraint matrix. This empty problem object must be populated with data. This step can be carried out in several ways.

• The problem object can be populated by assembling arrays of data and then calling CPXcopylp to copy the data into the problem object. (For example, see Building and Solving a Small LP Model in C .)
• Alternatively, you can populate the problem object by sequences of calls to the routines CPXnewcols, CPXnewrows, CPXaddcols, CPXaddrows, and CPXchgcoeflist; these routines may be called in any order that is convenient. (For example, see Adding Rows to a Problem: Example lpex3.c .)
• If the data already exist in a file using MPS format or LP format, you can use CPXreadcopyprob to read the file and copy the data into the problem object. (For example, see Reading a Problem from a File: Example lpex2.c .)