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Showing content from http://accord-framework.net/docs/html/M_Accord_Math_Matrix_FirstOrNull__1.htm below:

MatrixFirstOrNullT Method

Gets the indices of the first element matching a certain criteria, or null if the element could not be found.

Namespace:  Accord.Math
Assembly:

Accord.Math (in Accord.Math.dll) Version: 3.8.0

Syntax 
public static Nullable<int> FirstOrNull<T>(
	this T[] data,
	Func<T, bool> func
)

<ExtensionAttribute>
Public Shared Function FirstOrNull(Of T) ( 
	data As T(),
	func As Func(Of T, Boolean)
) As Nullable(Of Integer)
Request Example View Source Parameters
data
Type: T
The array to search inside.
func
Type: SystemFuncT, Boolean
The search criteria.
Type Parameters
T
The type of the array.
Return Value

Type:

NullableInt32 Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type . When you use instance method syntax to call this method, omit the first parameter. For more information, see

Extension Methods (Visual Basic)

or

Extension Methods (C# Programming Guide)

.

See Also

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