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

MatrixGetIndices Method

Creates a vector containing every index that can be used to address a given array, in order.

Namespace:  Accord.Math
Assembly:

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

Syntax
public static IEnumerable<int[]> GetIndices(
	this Array array,
	bool deep = false,
	bool max = false
)
<ExtensionAttribute>
Public Shared Function GetIndices ( 
	array As Array,
	Optional deep As Boolean = false,
	Optional max As Boolean = false
) As IEnumerable(Of Integer())
Request Example View Source Parameters
array
Type: SystemArray
The array whose indices will be returned.
deep (Optional)
Type: SystemBoolean
Pass true to retrieve all dimensions of the array, even if it contains nested arrays (as in jagged matrices).
max (Optional)
Type: SystemBoolean
Bases computations on the maximum length possible for each dimension (in case the jagged matrices has different lengths).
Return Value

Type:

IEnumerableInt32

An enumerable object that can be used to iterate over all positions of the given

array

.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type

Array

. 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)

.

Examples
double[,] a = 
{ 
   { 5.3, 2.3 },
   { 4.2, 9.2 }
};

foreach (int[] idx in a.GetIndices())
{
   
   double e = (double)a.GetValue(idx);
}
See Also

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