DFGenericColumnApply(String, FuncDouble, Boolean) Method

Returns a new numeric column with the given name and size containing the items in this column that evaluate to true using the given logical function.

Namespace: CenterSpace.NMath.Core
Assembly: NMath (in NMath.dll) Version: 7.4

Syntax

C++

Copy

public DFNumericColumn Apply(
	string name,
	Func<double, bool> function
)

Public Function Apply ( 
	name As String,
	function As Func(Of Double, Boolean)
) As DFNumericColumn

public:
DFNumericColumn^ Apply(
	String^ name, 
	Func<double, bool>^ function
)

member Apply : 
        name : string * 
        function : Func<float, bool> -> DFNumericColumn

Parameters

name String: Name for the new column.
function FuncDouble, Boolean: A delegate object representing a function that takes a single double parameter and returns a bool.

Return Value

DFNumericColumn
A new column with the given name containing the items in this column that evaluate to true using the given logical function.

Remarks

For example, if you apply a function that returns true if a number is greater than two to a column containing 1, 3, 4, 5, 3, 2, 4, a new column containing 3, 4, 5, 3, 4 is returned. An attempt will be made to convert each value in this column to a double to perform the operation. No data in this column will be changed.

Reference

DFGenericColumn Class

Apply Overload

CenterSpace.NMath.Core Namespace