Secant | 
The SecantLineSearch type exposes the following members.
| Name | Description | |
|---|---|---|
| costFunction_ |  Optimization Cost Function  (Inherited from OptimizationMethod)  | |
| endCriteria_ |  Optimization ending critera  (Inherited from OptimizationMethod)  | |
| sigma_0 | Value of sigma for first step of each Secant method minimization |