Aptech Systems, Inc. Worldwide Headquarters
Aptech Systems, Inc.
2350 East Germann Road, Suite #21
Chandler, AZ 85286
Ready to Get Started?
For Pricing and Distribution
Training & Events
Step-by-step, informative lessons for those who want to dive into GAUSS and achieve their goals, fast.
Have a Specific Question?
Q&A: Register and Login
Premier Support and Platinum Premier Support are annually renewable membership programs that provide you with important benefits including technical support, product maintenance, and substantial cost-saving features for your GAUSS System or the GAUSS Engine.
Join our community to see why our users are considered some of the most active and helpful in the industry!
Where to Buy
Available across the globe, you can have access to GAUSS no matter where you are.
Recent Tagsapplications character vectors CML CMLMT Constrained Optimization datasets dates dlibrary dllcall error error codes errors Excel FANPACMT file i/o floating network GAUSS Engine GAUSSplot graphics GUI hotkeys installation Java API libraries license licensing linux loading data loops matrices matrix manipulation Maxlik MaxLikMT operators optimization Optmum PQG graphics procs random numbers string functions strings structures threading Time Series writing data
Time Series 2.0 MT
Find out more now
Time Series MT 2.1
I received the error code “Hessian calculation failed”
My hessian calculation failed. How can I find out why?
The first step in finding out why your hessian calculation failed is to find and store the hessian. You can find instructions on that step here.
Once you have your hessian, you should check the eigenvalues. You can use the GAUSS functions eig() or eigh() for this. If any of the eigenvalues are zero (or zero to machine precision i.e. 1e-15 or so) then your hessian has some linear dependencies. You can alternatively check the rank of the matrix with the rank function.