---
name: "sc_LYPCFunctional"
section: "3"
platform: "linux"
package: "libsc-doc"
version: "2.3.1-22"
release: "Debian 12 (Bookworm)"
platforms: ["linux"]
url: "https://new.carta.tech/sc_LYPCFunctional"
---

# sc\_LYPCFunctional(3)

Implements the Lee, Yang, and Parr functional.

## NAME

sc::LYPCFunctional - Implements the Lee, Yang, and Parr functional.

## SYNOPSIS

`#include <functional.h>`

Inherits **sc::DenFunctional**.

### Public Member Functions

**LYPCFunctional** (const **Ref**\< **KeyVal** \> &)\
 **LYPCFunctional** (**StateIn** &)\
 void **save\_data\_state** (**StateOut** &)\
 Save the base classes (with save\_data\_state) and the members in the same order that the **StateIn** CTOR initializes them.  int **need\_density\_gradient** ()\
 void **point** (const **PointInputData** &, **PointOutputData** &)\

### Protected Member Functions

void **init\_constants** ()\

### Protected Attributes

double **a\_**\
 double **b\_**\
 double **c\_**\
 double **d\_**\

### Additional Inherited Members

## Detailed Description

Implements the Lee, Yang, and Parr functional.

B. Miehlich, A. Savin, H. Stoll and H. Preuss, Chem. Phys. Lett., 157(3), pp. 200-206, 1989.

C. Lee, W. Yang, and R. G. Parr, Phys. Rev. B, 37(2), pp 785-789, 1988.

## Member Function Documentation

### int sc::LYPCFunctional::need\_density\_gradient ()` [virtual]`

Reimplemented from **sc::DenFunctional**.

### void sc::LYPCFunctional::point (const PointInputData &, PointOutputData &)` [virtual]`

Implements **sc::DenFunctional**.

### void sc::LYPCFunctional::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::DenFunctional**.

## Author

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