TSparseMtx.ThreshAbsLT Method

Overload List

#	Signature	Description
1	TMtxVec ThreshAbsLT(TMtxVec Src, Double Value)	Perform threshold operation on all Src object values.
	└ indexed: TMtxVec ThreshAbsLT(TMtxVec Vec, Double Value, Int32 VecIndex, Int32 Index, Int32 Len)
2	TMtxVec ThreshAbsLT(Double Value)	Threshold top and bottom centered around zero.
	└ indexed: TMtxVec ThreshAbsLT(Double Value, Int32 Index, Int32 Len)

Overload 1: TMtxVec ThreshAbsLT(TMtxVec Src, Double Value)

Perform threshold operation on all Src object values.

#	Name	Type	Description
1	Src	TMtxVec	source TVec or TMtx
2	Value	Double	scalar

Result: stored in self (calling object), returns self for chaining

Remarks:

Store the results in calling object. Size and Dew.Math.TMtxVec.Complex properties of the calling object are adjusted automatically.

Indexed: TMtxVec ThreshAbsLT(TMtxVec Vec, Double Value, Int32 VecIndex, Int32 Index, Int32 Len)

Perform a threshold operation Vec elements [VecIndex]..[VecIndex+Len-1].

#	Name	Type	Description
1	Vec	TMtxVec	source TVec or TMtx
2	Value	Double	scalar
3	VecIndex	Int32
4	Index	Int32	start index
5	Len	Int32	element count

Result: stored in self (calling object), returns self for chaining

Remarks:

Store the results in the calling object elements [Index]..[Index+Len-1]. Size and Dew.Math.TMtxVec.Complex properties of the calling object must be set explicitly. An exception is raised if Dew.Math.TMtxVecBase.ConditionCheck is true and array borders are overrun/underrun.

Overload 2: TMtxVec ThreshAbsLT(Double Value)

Threshold top and bottom centered around zero.

#	Name	Type	Description
1	Value	Double	scalar

Result: stored in self (calling object), returns self for chaining

Remarks:

Perform threshold operation on all calling object values. The Value parameter is an upper bound for threshold operation. All values smaller than Value will be replaced with Value and all values bigger than -Value will be replaced with -Value. The comparison checks if abs(Values[i]) < Value.

Examples

using Dew.Math;
using Dew.Math.Units;

namespace Dew.Examples
{
    void Example()
    {
        TVec a;
        MtxVec.CreateIt(out a);
        try
        {
            a.SetIt(false, new double[] {2,-0.1,3,4});
            a.ThreshAbsLT(0.2); // a = [2,-0.2,3,4]
        }
        finally
        {
            MtxVec.FreeIt(ref a);
        }
    }
}

Matrix a = new Matrix();
a.SetIt(1, 5, false, new double[] { 1.0, 5.0, 3.0, 7.0, 2.0 });
a.ThreshAbsLT(4.0);
Matrix expected = new Matrix();
expected.SetIt(1, 5, false, new double[] { 4.0, 5.0, 4.0, 7.0, 4.0 });
if (!a.IsEqual(expected, 1e-10, TCompare.cmpAbsolute))
    throw new Exception("Matrix.ThreshAbsLT: mismatch");

Indexed: TMtxVec ThreshAbsLT(Double Value, Int32 Index, Int32 Len)

Perfrom the threshold operation on calling object values [Index]..[Index+Len-1].

#	Name	Type	Description
1	Value	Double	scalar
2	Index	Int32	start index
3	Len	Int32	element count

Result: stored in self (calling object), returns self for chaining

Remarks:

An exception is raised if array borders are overrun/underrun.