readme_extension

这是C语言版本的Linear Programming,同lpmex的功能是一样的

This program is an extension of the lpmex software written by 

          Jeffrey C. Kantor
          University of Notre Dame
          [e-mail]

          Adam C. Chen
          University of Notre Dame
          [e-mail]

The extensions are made by

          Fredrik Altenstedt
          Chalmers University of Technology
          [e-mail]

The submission of this program to the Matlab ftp archive was suggested by prof. Kantor. 

The extensions are intended to make all the information lpsolve reads from an external file avalible from within matlab. Specifically it makes it possible to use lpmex for reading MPS-files into matlab.

Testing of the program was done with matlab 5.3 (5.3.0.10183).

Instructions for using the program:

Step 1
Get the lpmex software.

Step 2
Replace the file lpmex.c by the one obtained with this document.

Step 3
Follow the instructions from the original lpmex distribution.


In addition to the functions decribed in the  README_MEX file of lpmex
these extra functions are included.

  Functions that return Information:

[value] = lpmex('get_no_rows', lp_handle)
          Return number of rows in the problem.

[value] = lpmex('get_no_cols', lp_handle)
          Return number of columns in the problem.

[col_vec] = lpmex('get_orig_rh_vec', lp_handle)
            Return original right hand values.

[row_vec] = lpmex('get_obj_fun', lp_handle)
            Return objective row.
          
[col_vec] = lpmex('get_orig_lowbo', lp_handle)
            Return original lower bounds on variables.
            A value = -1e24 means -Inf.

[col_vec] = lpmex('get_orig_upbo', lp_handle)
            Return original upper bounds on variables.
            A value = 1e24 means Inf.
            
[row_vec] = lpmex('get_constr_types', lp_handle)
            Return constraint types, 0 means LE, 1 means EQ and 2 means GE.

[value] =  lpmex('get_nonzeros', lp_handle)
           Return number of nonzeros in the matrix.

[row_cellArray] = lpmex('get_col_names', lp_handle)
                  Return the names of columns. 

[col_cellArray] = lpmex('get_row_names', lp_handle)
                  Return the names of rows.

[string] =  lpmex('get_objective_name', lp_handle)
            Return the objective name.

[string] =  lpmex('get_problem_name', lp_handle)
            Return the problem name.

[col_vec] = lpmex('get_int', lp_handle)
            Retrun integer requirements on variables.
            0 means no integer requirement, 1 integer requirement.