lu8mod
| var_name | c_type  | length | comment     |
|----------+---------+--------+-------------|
| mode     | int64_t | 1      |             |
| m        | int64_t | 1      | num rows    |
| n        | int64_t | 1      | num columns |
| beta     | double  | 1      |             |
| v        | double  | m      |             |
| w        | double  | n      |             |
| lena     | int64_t | 1      |             |
| luparm   | int64_t | 30     |             |
| parmlu   | double  | 30     |             |
| a        | double  | lena   |             |
| indc     | int64_t | lena   |             |
| indr     | int64_t | lena   |             |
| p        | int64_t | m      |             |
| q        | int64_t | n      |             |
| lenc     | int64_t | n      |             |
| lenr     | int64_t | m      |             |
| locc     | int64_t | n      |             |
| locr     | int64_t | m      |             |
| inform   | int64_t | 1      |             |
