lu6sol
| var_name | c_type  | length | comment            |
|----------+---------+--------+--------------------|
| mode     | int64_t | 1      | subroutine mode    |
| m        | int64_t | 1      | number of rows     |
| n        | int64_t | 1      | number of rows     |
| v        | double  | m      | io vector          |
| w        | double  | n      | io vector          |
| lena     | int64_t | 1      | length of storage  |
| luparm   | int64_t | 30     | integer parameters |
| parmlu   | double  | 30     | double parameters  |
| a        | double  | lena   | non-zeros          |
| indc     | int64_t | lena   | indices            |
| indr     | int64_t | lena   | indices            |
| p        | int64_t | m      | row permutation    |
| q        | int64_t | n      | col permutation    |
| lenc     | int64_t | n      |                    |
| lenr     | int64_t | m      |                    |
| locc     | int64_t | n      |                    |
| locr     | int64_t | m      |                    |
| inform   | int64_t | 1      |                    |
