MultiColBitmap (Apache SystemDS 3.0.0 API)

java.lang.Object
- org.apache.sysds.runtime.compress.bitmap.ABitmap
- - org.apache.sysds.runtime.compress.bitmap.MultiColBitmap

```
public final class MultiColBitmap
extends ABitmap
```
Uncompressed representation of one or more columns in bitmap format.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`int`	`getNumColumns()`	Get the number of columns encoded in this bitmap
`int`	`getNumNonZerosInOffset(int idx)`	Get the number of non zeros in a specific offset's tuple value.
`int`	`getNumValues()`	Obtain number of distinct value groups in the column.
`double[]`	`getValues(int ix)`	Obtain tuple of column values associated with index.

Methods inherited from class org.apache.sysds.runtime.compress.bitmap.ABitmap
containsZero, getNumOffsets, getNumOffsets, getNumZeros, getOffsetList, getOffsetsList, toString

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Method Detail
  - getValues
```
public double[] getValues(int ix)
```
    Obtain tuple of column values associated with index.
    
    Parameters:
    
    ix - index of a particular distinct value
    
    Returns:
    
    the tuple of column values associated with the specified index
  - getNumNonZerosInOffset
```
public int getNumNonZerosInOffset(int idx)
```
    Description copied from class: ABitmap
    
    Get the number of non zeros in a specific offset's tuple value.
    
    Specified by:
    
    getNumNonZerosInOffset in class ABitmap
    
    Parameters:
    
    idx - The offset index to look at.
    
    Returns:
    
    The nnz in the tuple.
  - getNumValues
```
public int getNumValues()
```
    Description copied from class: ABitmap
    
    Obtain number of distinct value groups in the column. this number is also the number of bitmaps, since there is one bitmap per value
    
    Specified by:
    
    getNumValues in class ABitmap
    
    Returns:
    
    number of distinct value groups in the column;
  - getNumColumns
```
public int getNumColumns()
```
    Description copied from class: ABitmap
    
    Get the number of columns encoded in this bitmap
    
    Specified by:
    
    getNumColumns in class ABitmap
    
    Returns:
    
    The column count