Xpress-SLP Statistics

When a matrix is read in using XSLPreadprob, statistics on the model are produced. They should be interpreted as described in the numbered footnotes:

Reading Problem xxx                                               (1)
Problem Statistics
        1920 (      0 spare) rows                                 (2)
         899 (      0 spare) structural columns                   (3)
        6683 (   3000 spare) non-zero elements                    (4)
Global Statistics
      0 entities   0 sets    0 set members                        (5)
Xpress-SLP Statistics:
        3632 coefficients                                         (6)
          14 extended variable arrays                             (7)
           1 user functions                                       (8)
        1011 SLP variables                                        (9)

Notes:

1. Standard output from XPRSreadprob reading the linear part of the problem
2. Number of rows declared in the ROWS section
3. Number of columns with at least one constant coefficient
4. Number of constant elements
5. Integer and SOS statistics if appropriate
6. Number of non-constant coefficients
7. Number of XVs defined
8. Number of user functions defined
9. Number of variables identified as SLP variables (interacting with a non-linear coefficient)

When the original problem is augmented prior to optimization, the following statistics are produced:

Xpress-SLP Augmentation Statistics:	
  Columns:	
         754 implicit SLP variables                              (10)
        1010 delta vectors                                       (11)
        2138 penalty error vectors (1177 positive, 961 negative) (12)
  Rows:	
        1370 nonlinear constraints                               (13)
        1010 update rows                                         (14)
           1 penalty error rows                                  (15)
  Coefficients:	
       11862 non-constant coefficients                           (16)

Notes:

10. SLP variables appearing only in coefficients and having no constant elements
11. Number of delta vectors created
12. Numbers of penalty error vectors
13. Number of constraints containing nonlinear terms
14. Number of update rows (equals number of delta vectors)
15. Number of rows totaling penalty vectors (error or delta)
16. Number of non-constant coefficients in the linear augmented matrix

If the matrix is read in using the XPRSloadxxx and XSLPloadxxx functions then these statistics may not be produced. However, most of the values are accessible through Xpress NonLinear integer attributes using the XSLPgetintattrib function.