DoubleColumn (tablesaw-core 0.12.0 API)

java.lang.Object
- tech.tablesaw.columns.AbstractColumn
- - tech.tablesaw.api.DoubleColumn

All Implemented Interfaces:

it.unimi.dsi.fastutil.doubles.DoubleIterable, Iterable<Double>, NumericColumn, Column
```
public class DoubleColumn
extends AbstractColumn
implements it.unimi.dsi.fastutil.doubles.DoubleIterable, NumericColumn
```
A column in a base table that contains double precision floating point values

Field Summary

Fields
Modifier and Type Field and Description

static double MISSING_VALUE

Fields
Modifier and Type	Field and Description
`static double`	`MISSING_VALUE`

Constructor Summary

Constructors
Constructor and Description
`DoubleColumn(ColumnMetadata metadata)`
`DoubleColumn(String name)`
`DoubleColumn(String name, double[] arr)`
`DoubleColumn(String name, int initialSize)`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`DoubleColumn`	`abs()` Returns a doubleColumn with the absolute value of each value in this column
`void`	`append(Column column)`
`void`	`append(double d)` Adds the given double to this column
`void`	`append(float f)` Adds the given float to this column
`void`	`appendCell(String object)`
`byte[]`	`asBytes(int rowNumber)` Returns the contents of the cell at rowNumber as a byte[]
`double[]`	`asDoubleArray()`
`it.unimi.dsi.fastutil.doubles.DoubleArrayList`	`bottom(int n)` Returns the smallest ("bottom") n values in the column
`int`	`byteSize()` Returns the width of a cell in this column, in bytes.
`void`	`clear()`
`boolean`	`contains(double value)`
`static double`	`convert(String stringValue)` Returns a double that is parsed from the given String
`DoubleColumn`	`copy()` Returns a deep copy of the receiver
`int`	`countMissing()` Returns the count of missing values in this column
`int`	`countUnique()` Returns the count of unique values in this column.
`DoubleColumn`	`cube()`
`DoubleColumn`	`cubeRoot()`
`DoubleColumn`	`cumProd()` Returns a new column with a cumulative product calculated
`DoubleColumn`	`cumSum()` Returns a new column with a cumulative sum calculated
`it.unimi.dsi.fastutil.doubles.DoubleArrayList`	`data()`
`DoubleColumn`	`difference()` Returns a new column of the same type as the receiver, such that the values in the new column contain the difference between each cell in the original and it's predecessor.
`DoubleColumn`	`emptyCopy()` Returns a copy of the receiver with no data.
`DoubleColumn`	`emptyCopy(int rowSize)` Returns an empty copy of the receiver, with its internal storage initialized to the given row size.
`double`	`firstElement()`
`double`	`geometricMean()`
`double`	`get(int index)`
`double`	`getDouble(int index)` Returns double value at `index` position in the column.
`String`	`getString(int row)` Returns a string representation of the value at the given row.
`boolean`	`isEmpty()` Returns true if the column has no data
`Selection`	`isEqualTo(double d)`
`Selection`	`isEqualTo(DoubleColumn d)`
`Selection`	`isGreaterThan(double f)`
`Selection`	`isGreaterThan(DoubleColumn d)`
`Selection`	`isGreaterThanOrEqualTo(double f)`
`Selection`	`isLessThan(double f)`
`Selection`	`isLessThan(DoubleColumn d)`
`Selection`	`isLessThanOrEqualTo(double f)`
`Selection`	`isMissing()`
`protected static boolean`	`isMissing(double value)`
`Selection`	`isNegative()`
`Selection`	`isNonNegative()`
`Selection`	`isNotEqualTo(double d)`
`Selection`	`isNotMissing()`
`Selection`	`isPositive()`
`Selection`	`isZero()`
`it.unimi.dsi.fastutil.doubles.DoubleIterator`	`iterator()`
`double`	`kurtosis()`
`DoubleColumn`	`log10()` Returns the base 10 log of the values in this column as a new DoubleColumn
`DoubleColumn`	`log1p()` Returns the natural log of the values in this column, after adding 1 to each so that zero values don't return -Infinity
`DoubleColumn`	`logN()` Returns the natural log of the values in this column as a new DoubleColumn
`double`	`max()`
`double`	`mean()`
`double`	`median()`
`double`	`min()`
`DoubleColumn`	`neg()` For each item in the column, returns the same number with the sign changed.
`DoubleColumn`	`pctChange()` Returns a new column with a percent change calculated
`double`	`percentile(double percentile)`
`double`	`populationVariance()`
`String`	`print()`
`double`	`product()`
`double`	`quadraticMean()` Returns the quadraticMean, aka the root-mean-square, for all values in this column
`double`	`quartile1()`
`double`	`quartile3()`
`double`	`range()`
`DoubleColumn`	`remainder(DoubleColumn column2)`
`DoubleColumn`	`round()`
`IntColumn`	`roundInt()` Returns the rounded values as a IntColumn.
`LongColumn`	`roundLong()` Returns the rounded values as a LongColumn
`it.unimi.dsi.fastutil.ints.IntComparator`	`rowComparator()` Compares the given ints, which refer to the indexes of the doubles in this column, according to the values of the doubles themselves
`Selection`	`select(DoubleBiPredicate predicate, double value)`
`Selection`	`select(DoublePredicate predicate)`
`void`	`set(double newValue, Selection rowSelection)` Conditionally update this column, replacing current values with newValue for all rows where the current value matches the selection criteria Example: myColumn.set(4.0, myColumn.isMissing()); // no more missing values
`void`	`set(int r, double value)`
`int`	`size()`
`double`	`skewness()`
`void`	`sortAscending()`
`void`	`sortDescending()`
`DoubleColumn`	`sqrt()`
`DoubleColumn`	`square()` Returns a doubleColumn with the square of each value in this column
`double`	`standardDeviation()`
`Stats`	`stats()`
`double`	`sum()`
`Table`	`summary()`
`double`	`sumOfLogs()`
`double`	`sumOfSquares()`
`it.unimi.dsi.fastutil.doubles.DoubleArrayList`	`top(int n)` Returns the largest ("top") n values in the column
`String`	`toString()`
`ColumnType`	`type()` Returns this column's ColumnType
`DoubleColumn`	`unique()` Returns a column of the same type as the receiver, containing only the unique values of the receiver.
`double`	`variance()`

Methods inherited from class tech.tablesaw.columns.AbstractColumn
columnMetadata, columnWidth, comment, id, metadata, name, setComment, setName

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

Methods inherited from interface it.unimi.dsi.fastutil.doubles.DoubleIterable
forEach, forEach

Methods inherited from interface java.lang.Iterable
spliterator

Methods inherited from interface tech.tablesaw.api.NumericColumn
add, add, addColumns, divide, divide, divideColumns, getFloat, getInt, getLong, multiply, multiply, multiplyColumns, subtract, subtract, subtractColumns

Methods inherited from interface tech.tablesaw.columns.Column
columnMetadata, columnWidth, comment, first, first, id, last, last, metadata, name, rolling, setComment, setName, subset, title

- Field Detail
  - MISSING_VALUE
```
public static final double MISSING_VALUE
```
- Constructor Detail
  - DoubleColumn
```
public DoubleColumn(String name)
```
  - DoubleColumn
```
public DoubleColumn(String name,
                    int initialSize)
```
  - DoubleColumn
```
public DoubleColumn(String name,
                    double[] arr)
```
  - DoubleColumn
```
public DoubleColumn(ColumnMetadata metadata)
```
- Method Detail
  - isMissing
```
protected static boolean isMissing(double value)
```
  - convert
```
public static double convert(String stringValue)
```
    Returns a double that is parsed from the given String
    We remove any commas before parsing
  - size
```
public int size()
```
    Specified by:
    
    size in interface Column
  - summary
```
public Table summary()
```
    Specified by:
    
    summary in interface Column
  - stats
```
public Stats stats()
```
  - countUnique
```
public int countUnique()
```
    Description copied from interface: Column
    
    Returns the count of unique values in this column.
    
    Specified by:
    
    countUnique in interface Column
    
    Returns:
    
    unique values as int
  - top
```
public it.unimi.dsi.fastutil.doubles.DoubleArrayList top(int n)
```
    Returns the largest ("top") n values in the column
    
    Parameters:
    
    n - The maximum number of records to return. The actual number will be smaller if n is greater than the number of observations in the column
    
    Returns:
    
    A list, possibly empty, of the largest observations
  - bottom
```
public it.unimi.dsi.fastutil.doubles.DoubleArrayList bottom(int n)
```
    Returns the smallest ("bottom") n values in the column
    
    Parameters:
    
    n - The maximum number of records to return. The actual number will be smaller if n is greater than the number of observations in the column
    
    Returns:
    
    A list, possibly empty, of the smallest n observations
  - unique
```
public DoubleColumn unique()
```
    Description copied from interface: Column
    
    Returns a column of the same type as the receiver, containing only the unique values of the receiver.
    
    Specified by:
    
    unique in interface Column
    
    Returns:
    
    a Column
  - data
```
public it.unimi.dsi.fastutil.doubles.DoubleArrayList data()
```
  - type
```
public ColumnType type()
```
    Description copied from interface: Column
    
    Returns this column's ColumnType
    
    Specified by:
    
    type in interface Column
    
    Returns:
    
    ColumnType
  - firstElement
```
public double firstElement()
```
  - sum
```
public double sum()
```
  - product
```
public double product()
```
    Specified by:
    
    product in interface NumericColumn
  - mean
```
public double mean()
```
    Specified by:
    
    mean in interface NumericColumn
  - median
```
public double median()
```
    Specified by:
    
    median in interface NumericColumn
  - quartile1
```
public double quartile1()
```
    Specified by:
    
    quartile1 in interface NumericColumn
  - quartile3
```
public double quartile3()
```
    Specified by:
    
    quartile3 in interface NumericColumn
  - percentile
```
public double percentile(double percentile)
```
    Specified by:
    
    percentile in interface NumericColumn
  - range
```
public double range()
```
    Specified by:
    
    range in interface NumericColumn
  - max
```
public double max()
```
    Specified by:
    
    max in interface NumericColumn
  - min
```
public double min()
```
    Specified by:
    
    min in interface NumericColumn
  - variance
```
public double variance()
```
    Specified by:
    
    variance in interface NumericColumn
  - populationVariance
```
public double populationVariance()
```
    Specified by:
    
    populationVariance in interface NumericColumn
  - standardDeviation
```
public double standardDeviation()
```
    Specified by:
    
    standardDeviation in interface NumericColumn
  - sumOfLogs
```
public double sumOfLogs()
```
    Specified by:
    
    sumOfLogs in interface NumericColumn
  - sumOfSquares
```
public double sumOfSquares()
```
    Specified by:
    
    sumOfSquares in interface NumericColumn
  - geometricMean
```
public double geometricMean()
```
    Specified by:
    
    geometricMean in interface NumericColumn
  - quadraticMean
```
public double quadraticMean()
```
    Returns the quadraticMean, aka the root-mean-square, for all values in this column
    
    Specified by:
    
    quadraticMean in interface NumericColumn
  - kurtosis
```
public double kurtosis()
```
    Specified by:
    
    kurtosis in interface NumericColumn
  - skewness
```
public double skewness()
```
    Specified by:
    
    skewness in interface NumericColumn
  - append
```
public void append(float f)
```
    Adds the given float to this column
  - append
```
public void append(double d)
```
    Adds the given double to this column
  - isLessThan
```
public Selection isLessThan(double f)
```
  - isMissing
```
public Selection isMissing()
```
    Specified by:
    
    isMissing in interface Column
  - isNotMissing
```
public Selection isNotMissing()
```
    Specified by:
    
    isNotMissing in interface Column
  - isGreaterThan
```
public Selection isGreaterThan(double f)
```
  - isGreaterThanOrEqualTo
```
public Selection isGreaterThanOrEqualTo(double f)
```
  - isLessThanOrEqualTo
```
public Selection isLessThanOrEqualTo(double f)
```
  - isNotEqualTo
```
public Selection isNotEqualTo(double d)
```
  - isEqualTo
```
public Selection isEqualTo(double d)
```
  - isEqualTo
```
public Selection isEqualTo(DoubleColumn d)
```
  - isGreaterThan
```
public Selection isGreaterThan(DoubleColumn d)
```
  - isLessThan
```
public Selection isLessThan(DoubleColumn d)
```
  - getString
```
public String getString(int row)
```
    Description copied from interface: Column
    
    Returns a string representation of the value at the given row.
    
    Specified by:
    
    getString in interface Column
    
    Parameters:
    
    row - The index of the row.
    
    Returns:
    
    value as String
  - emptyCopy
```
public DoubleColumn emptyCopy()
```
    Description copied from interface: Column
    
    Returns a copy of the receiver with no data. The column name and type are the same.
    
    Specified by:
    
    emptyCopy in interface Column
    
    Returns:
    
    a empty copy of Column
  - emptyCopy
```
public DoubleColumn emptyCopy(int rowSize)
```
    Description copied from interface: Column
    
    Returns an empty copy of the receiver, with its internal storage initialized to the given row size.
    
    Specified by:
    
    emptyCopy in interface Column
    
    Parameters:
    
    rowSize - the initial row size
    
    Returns:
    
    a Column
  - clear
```
public void clear()
```
    Specified by:
    
    clear in interface Column
  - copy
```
public DoubleColumn copy()
```
    Description copied from interface: Column
    
    Returns a deep copy of the receiver
    
    Specified by:
    
    copy in interface Column
    
    Returns:
    
    a Column
  - sortAscending
```
public void sortAscending()
```
    Specified by:
    
    sortAscending in interface Column
  - sortDescending
```
public void sortDescending()
```
    Specified by:
    
    sortDescending in interface Column
  - isEmpty
```
public boolean isEmpty()
```
    Description copied from interface: Column
    
    Returns true if the column has no data
    
    Specified by:
    
    isEmpty in interface Column
    
    Returns:
    
    true if empty, false if not
  - countMissing
```
public int countMissing()
```
    Returns the count of missing values in this column
    
    Specified by:
    
    countMissing in interface Column
    
    Returns:
    
    missing values as int
  - appendCell
```
public void appendCell(String object)
```
    Specified by:
    
    appendCell in interface Column
    
    Specified by:
    
    appendCell in class AbstractColumn
  - logN
```
public DoubleColumn logN()
```
    Returns the natural log of the values in this column as a new DoubleColumn
  - log10
```
public DoubleColumn log10()
```
    Returns the base 10 log of the values in this column as a new DoubleColumn
    
    Returns:
  - log1p
```
public DoubleColumn log1p()
```
    Returns the natural log of the values in this column, after adding 1 to each so that zero values don't return -Infinity
  - round
```
public DoubleColumn round()
```
  - roundLong
```
public LongColumn roundLong()
```
    Returns the rounded values as a LongColumn
  - roundInt
```
public IntColumn roundInt()
```
    Returns the rounded values as a IntColumn. This will throw an exception if the values are too large to fit, however many double columns can safely use this method. Use roundLong() if larger
    
    Throws:
    
    ClassCastException - if the returned value will not fit in an int
  - abs
```
public DoubleColumn abs()
```
    Returns a doubleColumn with the absolute value of each value in this column
  - square
```
public DoubleColumn square()
```
    Returns a doubleColumn with the square of each value in this column
  - sqrt
```
public DoubleColumn sqrt()
```
  - cubeRoot
```
public DoubleColumn cubeRoot()
```
  - cube
```
public DoubleColumn cube()
```
  - remainder
```
public DoubleColumn remainder(DoubleColumn column2)
```
  - neg
```
public DoubleColumn neg()
```
    For each item in the column, returns the same number with the sign changed. For example: -1.3 returns 1.3, 2.135 returns -2.135 0 returns 0
  - rowComparator
```
public it.unimi.dsi.fastutil.ints.IntComparator rowComparator()
```
    Compares the given ints, which refer to the indexes of the doubles in this column, according to the values of the doubles themselves
    
    Specified by:
    
    rowComparator in interface Column
  - get
```
public double get(int index)
```
  - getDouble
```
public double getDouble(int index)
```
    Description copied from interface: NumericColumn
    
    Returns double value at index position in the column. A conversion, if needed, could result in data or accuracy loss.
    
    Specified by:
    
    getDouble in interface NumericColumn
    
    Parameters:
    
    index - position in column
    
    Returns:
    
    double value at position
  - set
```
public void set(int r,
                double value)
```
  - set
```
public void set(double newValue,
                Selection rowSelection)
```
    Conditionally update this column, replacing current values with newValue for all rows where the current value matches the selection criteria Example: myColumn.set(4.0, myColumn.isMissing()); // no more missing values
  - isPositive
```
public Selection isPositive()
```
  - isZero
```
public Selection isZero()
```
  - isNegative
```
public Selection isNegative()
```
  - isNonNegative
```
public Selection isNonNegative()
```
  - asDoubleArray
```
public double[] asDoubleArray()
```
    Specified by:
    
    asDoubleArray in interface NumericColumn
    
    Specified by:
    
    asDoubleArray in interface Column
  - print
```
public String print()
```
    Specified by:
    
    print in interface Column
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object
  - append
```
public void append(Column column)
```
    Specified by:
    
    append in interface Column
  - iterator
```
public it.unimi.dsi.fastutil.doubles.DoubleIterator iterator()
```
    Specified by:
    
    iterator in interface it.unimi.dsi.fastutil.doubles.DoubleIterable
    
    Specified by:
    
    iterator in interface Iterable<Double>
  - select
```
public Selection select(DoublePredicate predicate)
```
  - select
```
public Selection select(DoubleBiPredicate predicate,
                        double value)
```
  - contains
```
public boolean contains(double value)
```
  - byteSize
```
public int byteSize()
```
    Description copied from interface: Column
    
    Returns the width of a cell in this column, in bytes.
    
    Specified by:
    
    byteSize in interface Column
    
    Returns:
    
    width in bytes
  - asBytes
```
public byte[] asBytes(int rowNumber)
```
    Returns the contents of the cell at rowNumber as a byte[]
    
    Specified by:
    
    asBytes in interface Column
    
    Parameters:
    
    rowNumber - index of the row
    
    Returns:
    
    content as byte[]
  - difference
```
public DoubleColumn difference()
```
    Description copied from interface: Column
    
    Returns a new column of the same type as the receiver, such that the values in the new column contain the difference between each cell in the original and it's predecessor. The Missing Value Indicator is used for the first cell in the new column. (e.g. IntColumn.MISSING_VALUE)
    
    Specified by:
    
    difference in interface Column
    
    Overrides:
    
    difference in class AbstractColumn
    
    Returns:
    
    a Column
  - cumSum
```
public DoubleColumn cumSum()
```
    Returns a new column with a cumulative sum calculated
  - cumProd
```
public DoubleColumn cumProd()
```
    Returns a new column with a cumulative product calculated
  - pctChange
```
public DoubleColumn pctChange()
```
    Returns a new column with a percent change calculated

Class DoubleColumn

Field Summary

Constructor Summary

Method Summary

Methods inherited from class tech.tablesaw.columns.AbstractColumn

Methods inherited from class java.lang.Object

Methods inherited from interface it.unimi.dsi.fastutil.doubles.DoubleIterable

Methods inherited from interface java.lang.Iterable

Methods inherited from interface tech.tablesaw.api.NumericColumn

Methods inherited from interface tech.tablesaw.columns.Column

Field Detail

MISSING_VALUE

Constructor Detail

DoubleColumn

DoubleColumn

DoubleColumn

DoubleColumn

Method Detail

isMissing

convert

size

summary

stats

countUnique

top

bottom

unique

data

type

firstElement

sum

product

mean

median

quartile1

quartile3

percentile

range

max

min

variance

populationVariance

standardDeviation

sumOfLogs

sumOfSquares

geometricMean

quadraticMean

kurtosis

skewness

append

append

isLessThan

isMissing

isNotMissing

isGreaterThan

isGreaterThanOrEqualTo

isLessThanOrEqualTo

isNotEqualTo

isEqualTo

isEqualTo

isGreaterThan

isLessThan

getString

emptyCopy

emptyCopy

clear

copy

sortAscending

sortDescending

isEmpty

countMissing

appendCell

logN

log10

log1p

round

roundLong

roundInt

abs

square