SparseStructure2D

All Superinterfaces:

Structure1D, Structure2D

All Known Implementing Classes:

ColumnsSupplier, CompressedSparseR064, R064CSC, R064CSR, RowsSupplier, SparseStore
```
public interface SparseStructure2D
extends Structure2D
```
Additional methods for sparse matrix implementations that store only non-zero elements.
This interface defines common functionality for sparse matrix structures, which are optimized for storing matrices where most elements are zero. Implementations typically use specialized data structures like Compressed Sparse Row (CSR), Compressed Sparse Column (CSC), or Coordinate Format (COO) to efficiently store and access non-zero elements.

The interface provides methods to:
- Count the number of non-zero elements in the matrix
- Calculate the density of the matrix (ratio of non-zero elements to total elements)
- Convert the sparse matrix to specific sparse formats (CSR, CSC)
Note: This interface extends Structure2D and provides additional sparse-specific functionality. The main matrix functionality is defined in other interfaces that implement this one.

Nested Class Summary
- Nested classes/interfaces inherited from interface org.ojalgo.structure.Structure1D
  Structure1D.BasicMapper<T>, Structure1D.IndexMapper<T>, Structure1D.IntIndex, Structure1D.LongIndex, Structure1D.LoopCallback
- Nested classes/interfaces inherited from interface org.ojalgo.structure.Structure2D
  Structure2D.IntRowColumn, Structure2D.Logical<S extends Structure2D,B extends Structure2D.Logical<S,B>>, Structure2D.LongRowColumn, Structure2D.ReducibleTo1D<R extends Structure1D>, Structure2D.Reshapable, Structure2D.RowColumnKey<R,C>, Structure2D.RowColumnMapper<R,C>

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`int`	`countNonzeros()`
`default double`	`density()`	Returns the density of the matrix, defined as the ratio of non-zero elements to the total number of elements in the matrix.
`R064CSC`	`toCSC()`
`R064CSR`	`toCSR()`

Methods inherited from interface org.ojalgo.structure.Structure2D
count, countColumns, countRows, firstInColumn, firstInRow, getColDim, getMaxDim, getMinDim, getRowDim, isEmpty, isFat, isScalar, isSquare, isTall, isVector, limitOfColumn, limitOfRow, size

- Method Detail
  - countNonzeros
```
int countNonzeros()
```
  - density
```
default double density()
```
    Returns the density of the matrix, defined as the ratio of non-zero elements to the total number of elements in the matrix.
    
    Returns:
    
    The density of the matrix, between 0.0 and 1.0
  - toCSC
```
R064CSC toCSC()
```
  - toCSR
```
R064CSR toCSR()
```