Accord.NET Framework
Framework modules
Accord.Math
Matrix Class
Matrix Methods
Abs Method
Add Method
AddToDiagonal Method
Apply Method
ApplyInPlace Method
ApplyWithIndex Method
ArgMax Method
ArgMin Method
ArgSort(T) Method
Bottom(T) Method
Cartesian Method
CartesianProduct Method
Ceiling Method
Centering Method
Clear Method
Columns Method
ColumnVector(T) Method
Concatenate Method
Convert Method
Convolve Method
Copy Method
CopyTo Method
Count(T) Method
Create Method
CreateAs Method
Cross Method
CumulativeSum Method
Decompose Method
DeepFlatten Method
DeepToMatrix Method
Determinant Method
Diagonal Method
DimensionEquals Method
Distinct Method
DistinctCount Method
Divide Method
DivideByDiagonal Method
ElementwiseDivide Method
ElementwiseMultiply Method
ElementwisePower Method
Equals Method
Exp Method
Expand Method
Find Method
First Method
FirstOrNull(T) Method
Flatten Method
Floor Method
Get Method
GetColumn Method
GetColumns Method
GetIndices Method
GetInnerMostType Method
GetLength Method
GetLowerTriangle Method
GetNumberOfElements Method
GetRange Method
GetRow Method
GetRows Method
GetSizeInBytes Method
GetSymmetric Method
GetTotalLength Method
GetUpperTriangle Method
GetValue Method
Has Method
HasInfinity Method
HasNaN Method
Identity Method
IndexOf(T) Method
Indices Method
Inner Method
InnerProduct Method
InsertColumn Method
InsertRow Method
Interval Method
Inverse Method
IsDiagonal Method
IsEqual Method
IsInteger Method
IsJagged Method
IsLowerTriangular Method
IsMatrix Method
IsPositiveDefinite Method
IsRectangular Method
IsRelativelyEqual Method
IsSingular Method
IsSorted Method
IsSquare Method
IsSymmetric Method
IsUpperTriangular Method
IsVector Method
JaggedDiagonal Method
JaggedIdentity Method
JaggedMagic Method
KHot Method
Kronecker Method
KroneckerProduct Method
Last(T) Method
Log Method
LogDeterminant Method
LogPseudoDeterminant Method
Magic Method
Max Method
MemberwiseClone Method
Merge Method
Mesh Method
MeshGrid(T) Method
Min Method
Multiply Method
MultiplyByDiagonal Method
MultiplyByTranspose Method
Normalize Method
Null Method
OneHot Method
Ones Method
Outer Method
OuterProduct Method
Pad Method
Parse Method
ParseJagged Method
Partition Method
Power Method
Product Method
PseudoDeterminant Method
PseudoInverse Method
Random Method
Range Method
Rank Method
Remove(T) Method
RemoveAll(T) Method
RemoveAt(T) Method
RemoveColumn Method
RemoveRow(T) Method
Replace(T) Method
Reshape Method
Reversed(T) Method
Round Method
Rows Method
RowVector(T) Method
Set Method
SetColumn Method
SetEquals(T) Method
SetRow Method
SetTo Method
SetValue Method
Sign Method
Solve Method
SolveForDiagonal Method
Sort Method
Split(T) Method
Sqrt Method
Square(T) Method
Stack Method
Subgroups Method
Submatrix Method
SubtractFromDiagonal Method
Sum Method
Swap Method
To Method
ToArray Method
ToBoolean Method
ToByte Method
ToCSharp Method
ToDecimal Method
ToDouble Method
ToInt16 Method
ToInt32 Method
ToInt32Array Method
ToInt64 Method
ToIntArray Method
ToJagged Method
ToLowerTriangular Method
ToMatrix Method
ToObject Method
ToOctave Method
Top(T) Method
ToSByte Method
ToSingle Method
ToString Method
ToTable Method
ToUpperTriangular Method
ToVector Method
Trace Method
Transpose Method
Trim Method
TryGetValue Method
TryParse Method
Vector Method
VectorProduct Method
Zeros Method
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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
Copy
public static Nullable<int> FirstOrNull<T>(
	this T[] data,
	Func<T, bool> func
)
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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