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

Summary

Actions Summary Table

ActionsDescription
Add(text column)
Compare(Libraries.Language.Object object)This action compares two object hash codes and returns an integer.
CreatesCopy()This action tells us whether or not this transform makes a copy of the data or modifies it in place.
Equals(Libraries.Language.Object object)This action determines if two objects are equal based on their hash code values.
GetHashCode()This action gets the hash code for an object.
Transform(Libraries.Compute.Statistics.DataFrame frame)

Actions Documentation

Add(text column)

Parameters

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.

Example Code

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

Parameters

Return

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

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.

Example Code

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.

Return

boolean: True if this transform makes a copy.

Equals(Libraries.Language.Object object)

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

Example Code

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

Parameters

Return

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

GetHashCode()

This action gets the hash code for an object.

Example Code

Object o
        integer hash = o:GetHashCode()

Return

integer: The integer hash code of the object.

Transform(Libraries.Compute.Statistics.DataFrame frame)

Parameters

Return

Libraries.Compute.Statistics.DataFrame