Libraries.Compute.Statistics.Transforms.ColumnFilterTransform Documentation

This action takes the data from the current DataFrame then reverses it so that the top row is now at the bottom and vice versa.

Example Code

use Libraries.Compute.Statistics.DataFrame
use Libraries.Compute.Statistics.Transforms.ColumnRowFilterTransform
use Libraries.System.File

//Load a comma separated file
DataFrame frame
frame:Load("Data.csv")

//Get a copy of the data frame's first two columns, up to row 5.
ColumnFilterTransform transform
transform:Add("DT")
frame:Transform(transform)

Inherits from: Libraries.Language.Object, Libraries.Compute.Statistics.DataFrameTransform

Actions Documentation

AddColumn(integer column)

Parameters

  • integer column

Compare(Libraries.Language.Object object)

This action compares two object hash codes and returns an integer. The result is larger if this hash code is larger than the object passed as a parameter, smaller, or equal. In this case, -1 means smaller, 0 means equal, and 1 means larger. This action was changed in Quorum 7 to return an integer, instead of a CompareResult object, because the previous implementation was causing efficiency issues.

Parameters

Return

integer: The Compare result, Smaller, Equal, or Larger.

Example

Object o
Object t
integer result = o:Compare(t) //1 (larger), 0 (equal), or -1 (smaller)

CreatesCopy()

This action tells us whether or not this transform makes a copy of the data or modifies it in place. Transforms that do not make a copy should override this action.

Return

boolean: True if this transform makes a copy.

Example

use Libraries.Compute.Statistics.DataFrame
use Libraries.Compute.Statistics.Transforms.ReverseTransform
use Libraries.System.File

//Load a comma separated file
DataFrame frame
frame:Load("Data.csv")

//reverse the data frame
ReverseTransform reverse
output reverse:CreatesCopy() // by default, this transform returns true.

Equals(Libraries.Language.Object object)

This action determines if two objects are equal based on their hash code values.

Parameters

Return

boolean: True if the hash codes are equal and false if they are not equal.

Example

use Libraries.Language.Object
use Libraries.Language.Types.Text
Object o
Text t
boolean result = o:Equals(t)

GetHashCode()

This action gets the hash code for an object.

Return

integer: The integer hash code of the object.

Example

Object o
integer hash = o:GetHashCode()

Transform(Libraries.Compute.Statistics.DataFrame frame)

Parameters

Return

Libraries.Compute.Statistics.DataFrame