Non-Differentiable Functions

1. Bartels Conn Function
   

   2-dimensional non-separable multimodal non-convex non-differentiable

2. Bukin N. 6 Function
   

   2-dimensional continuous convex non-differentiable non-separable multimodal convex non-scalable

3. Cross-in-Tray Function
   

   2-dimensional continuous non-differentiable non-separable multimodal non-convex

4. Holder-Table Function
   

   2-dimensional continuous non-differentiable non-separable multimodal non-convex

5. Powell Sum Function
   

   n-dimensional continuous non-differentiable separable unimodal convex

6. Schwefel 2.20 Function
   

   n-dimensional continuous non-differentiable separable unimodal convex

7. Schwefel 2.21 Function
   

   n-dimensional continuous non-differentiable separable unimodal convex

8. Schwefel 2.22 Function
   

   n-dimensional continuous non-differentiable separable unimodal convex

9. Schwefel Function
   

   continuous multimodal non-convex non-differentiable non-separable

10. Xin-She Yang Function
    

    n-dimensional separable multimodal non-convex random non-differentiable

11. Xin-She Yang N. 2 Function
    

    n-dimensional non-separable multimodal non-convex non-differentiable

12. Xin-She Yang N. 4 Function
    

    n-dimensional non-separable multimodal non-convex non-differentiable