[Ipopt] Size of the KKT matrix

[Senses,Begum]

Hello everyone,

I want to get the KKT matrix from Ipopt at every iteration. Therefore I 
set Ipopt print level to 12. As expected, Ipopt prints out the KKT 
matrix. The unexpected thing is the size of the KKT matrix. When I 
construct the KKT matrix  from the hessian and the jacobian, which I 
give to IPOPT at the beginning, it has a size 448 x 448. However, the 
size of the KKT matrix that Ipopt prints is 442 x 442. Does this mean 
the KKT matrix is rank deficient or is there anything else going on in 
the Ipopt that changes the size of the KKT matrix.

Sincerely

-- 
Senses, Begum