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

# sc\_SCMatrixDiagSubBlock(3)

The SCMatrixDiagSubBlock describes a diagonal subblock of a matrix.

## NAME

sc::SCMatrixDiagSubBlock - The **SCMatrixDiagSubBlock** describes a diagonal subblock of a matrix.

## SYNOPSIS

`#include <block.h>`

Inherits **sc::SCMatrixBlock**.

### Public Member Functions

**SCMatrixDiagSubBlock** (int istart, int iend, int jstart, int offset, double \*data)\
 **SCMatrixDiagSubBlock** (int istart, int iend, int offset, double \*data)\
 **SCMatrixDiagSubBlock** (**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.  void **process** (**SCElementOp** \*)\
 void **process** (**SCElementOp2** \*, **SCMatrixBlock** \*)\
 void **process** (**SCElementOp3** \*, **SCMatrixBlock** \*, **SCMatrixBlock** \*)\

### Public Attributes

int **istart**\
 int **jstart**\
 int **iend**\
 int **offset**\
 double \* **data**\

### Additional Inherited Members

## Detailed Description

The **SCMatrixDiagSubBlock** describes a diagonal subblock of a matrix.

The following bit of code illustrates the data layout: fill(double \*\*matrix, SCMatrixDiagSubBlock &b) { int i,j,offset=b.offset; for (i=b.istart,j=b.jstart; i\<b.iend; i++,j++,offset++) { matrix\[i\]\[j\] = b.data\[offset\]; } }

## Member Function Documentation

### void sc::SCMatrixDiagSubBlock::process (SCElementOp \*)` [virtual]`

Implements **sc::SCMatrixBlock**.

### void sc::SCMatrixDiagSubBlock::process (SCElementOp2 \*, SCMatrixBlock \*)` [virtual]`

Implements **sc::SCMatrixBlock**.

### void sc::SCMatrixDiagSubBlock::process (SCElementOp3 \*, SCMatrixBlock \*, SCMatrixBlock \*)` [virtual]`

Implements **sc::SCMatrixBlock**.

### void sc::SCMatrixDiagSubBlock::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::SCMatrixBlock**.

## Author

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