# sc_Convergence man page

sc::Convergence — The **Convergence** class is used by the optimizer to determine when an optimization is converged.

## Synopsis

`#include <conv.h>`

Inherits **sc::SavableState**.

Inherited by **sc::MolEnergyConvergence**.

### Public Member Functions

Convergence(double tolerance)Convergence(StateIn&)Convergence(constRef<KeyVal> &)TheKeyValconstructor reads the following keywords:

voidsave_data_state(StateOut&)Save the base classes (with save_data_state) and the members in the same order that theStateInCTOR initializes them.

virtual voidget_grad(constRef<Function> &)Set the current gradient and displacement.

virtual voidget_x(constRef<Function> &)

virtual voidset_nextx(constRefSCVector&)

virtual voidreset()Set the current gradient and displacement to null.

virtual intconverged()Return nonzero if the optimization has converged.

### Protected Member Functions

voidcheck_conv(const char *heading, double val, double bound, int &pass, int &fail)

voidset_defaults()

### Protected Attributes

RefSCVector grad_RefSCVector x_RefSCVector nextx_

intuse_max_disp_

doublemax_disp_

intuse_max_grad_

doublemax_grad_

intuse_rms_disp_

doublerms_disp_

intuse_rms_grad_

doublerms_grad_

intuse_graddisp_

doublegraddisp_

### Additional Inherited Members

## Detailed Description

The **Convergence** class is used by the optimizer to determine when an optimization is converged.

The **KeyVal** input for **Convergence** is given below. Giving none of these keywords is the same as giving the following input:

```
conv<Convergence>: (
max_disp = 1.0e-6
max_grad = 1.0e-6
graddisp = 1.0e-6
)
```

## Constructor & Destructor Documentation

### sc::Convergence::Convergence (const Ref< KeyVal > &)

The **KeyVal** constructor reads the following keywords:

`max_disp`

- The value of the maximum displacement must be less then the value of this keyword for the calculation to be converged. The default is to not check this parameter. However, if no other keyword are given, default convergence parameters are chosen as described above.

`max_grad`

- The value of the maximum gradient must be less then the value of this keyword for the calculation to be converged. The default is to not check this parameter. However, if no other keyword are given, default convergence parameters are chosen as described above.

`rms_disp`

- The value of the RMS of the displacements must be less then the value of this keyword for the calculation to be converged. The default is to not check this parameter. However, if no other keyword are given, default convergence parameters are chosen as described above.

`rms_grad`

- The value of the RMS of the gradients must be less then the value of this keyword for the calculation to be converged. The default is to not check this parameter. However, if no other keyword are given, default convergence parameters are chosen as described above.

`graddisp`

- The value of the scalar product of the gradient vector with the displacement vector must be less then the value of this keyword for the calculation to be converged. The default is to not check this parameter. However, if no other keyword are given, default convergence parameters are chosen as described above.

## Member Function Documentation

### void sc::Convergence::save_data_state (StateOut &) [virtual]

Save the base classes (with save_data_state) and the members in the same order that the **StateIn** CTOR initializes them. This must be implemented by the derived class if the class has data.

Reimplemented from **sc::SavableState**.

## Author

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