protected abstract class QuasiNewton.QuasiNewtonImpl extends SteepestDescent.SteepestDescentImpl
| Modifier and Type | Field and Description |
|---|---|
protected double |
ak
the increment in the search direction
|
protected Vector |
dk
the line search direction at the k-th iteration
|
protected Vector |
gk
the gradient at the k-th iteration
|
protected Matrix |
Sk
This is the approximate inverse of the Hessian matrix.
|
linesearch, problem| Modifier and Type | Method and Description |
|---|---|
Vector |
getDirection(Vector xk)
Get the next search direction.
|
double |
getIncrement(Vector xk,
Vector dk)
Get the increment fraction, αk.
|
minimizer, minimum, search, setInitials, stepprotected Matrix Sk
updateSk(com.numericalmethod.suanshu.vector.doubles.Vector)
modifies this incrementally.protected Vector gk
protected Vector dk
protected double ak
public Vector getDirection(Vector xk)
SteepestDescent.SteepestDescentImplgetDirection in class SteepestDescent.SteepestDescentImplxk - the current minimizerpublic double getIncrement(Vector xk, Vector dk)
SteepestDescent.SteepestDescentImplgetIncrement in class SteepestDescent.SteepestDescentImplxk - the current minimizerdk - the search direction