(@INIT_OPTG-target)=
# @INIT_OPTG
Initialize a geometry optimization.



## @INIT_OPTG

Go to @INIT_OPTG node.


 The engine performs any initialization operations that are necessary before a geometry optimization can be performed, 
proceeding to the @INIT_OPTG node.


:::{admonition} Note
:class: caution

This command may change the engine's atomic coordinates under certain circumstances, such as if the SHAKE algorithm is used.
:::

### Examples


::::{tab-set}

:::{tab-item} Python
:sync: python

```python
import mdi

# connect to the engine
mdi_engine = mdi.MDI_Accept_Communicator()

# initialize a geometry optimization.
mdi.MDI_Send_Command("@INIT_OPTG", mdi_engine)

```
:::

:::{tab-item} C++
:sync: cpp

```cpp
#include "mdi.h"

// connect to the engine
MDI_Comm mdi_engine = MDI_Accept_Communicator();

// initialize a geometry optimization.
MDI_Send_Command("@INIT_OPTG", mdi_engine);

```
:::

::::