lu1fac
| var_name | c_type  | length | comment                                                     |
|----------+---------+--------+-------------------------------------------------------------|
| m        | int64_t | 1      | number of rows                                              |
| n        | int64_t | 1      | number of columns                                           |
| nelem    | int64_t | 1      | number of matrix entries                                    |
| lena     | int64_t | 1      | dimension of a, indc, and indr                              |
| luparm   | int64_t | 30     | parameter vector                                            |
| parmlu   | double  | 30     | parameter vector                                            |
| a        | double  | lena   | nonzero entries                                             |
| indc     | int64_t | lena   | indices                                                     |
| indr     | int64_t | lena   | indices                                                     |
| p        | int64_t | m      | row permutations                                            |
| q        | int64_t | n      | column permutations                                         |
| lenc     | int64_t | n      | number of entries in nontrivial columns of L in pivot order |
| lenr     | int64_t | m      | number of entries in each row of U in original order        |
| locc     | int64_t | n      | "ready for LU update routines"                              |
| locr     | int64_t | m      | "points to the beginning of the rows of U in a, indr"       |
| iploc    | int64_t | n      |                                                             |
| iqloc    | int64_t | m      |                                                             |
| ipinv    | int64_t | m      |                                                             |
| iqinv    | int64_t | n      |                                                             |
| w        | double  | n      |                                                             |
| inform   | int64_t | 1      |                                                             |
