TSparseMtx.Log2 Method

Overload List

#	Signature	Description
1	TMtxVec Log2	Log base 2.
	└ indexed: TMtxVec Log2(Int32 Index, Int32 Len)
2	TMtxVec Log2(TMtxVec X)	Calculate the log base 2 for all X elements.
	└ indexed: TMtxVec Log2(TMtxVec X, Int32 XIndex, Int32 Index, Int32 Len)

Overload 1: TMtxVec Log2

Log base 2.

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

Remarks:

Calculate the log base 2 for all calling object elements in-place.

Examples

Matrix a = new Matrix();
a.SetIt(2, 2, false, new double[] { 1.0, 2.0, 4.0, 10.0 });
a.Log2();
Matrix expected = new Matrix();
expected.SetIt(2, 2, false, new double[] { 0.0, 1.0, 2.0, 3.32192809488736 });
if (!a.IsEqual(expected, 1e-10, TCompare.cmpAbsolute))
    throw new Exception("Matrix.Log2: mismatch");

Matrix a;
Matrix b;
a.SetIt(2,2,false,new double[] {1,2,4,8});
a.Log2;  //same as:
a = Log2(a);
b = Log2(a); //same as:
b.Log2(a);

Indexed: TMtxVec Log2(Int32 Index, Int32 Len)

Calculate the log base 2 for calling object elements [Index]..[Index+Len-1] in-place.

#	Name	Type	Description
1	Index	Int32	start index
2	Len	Int32	element count

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

Remarks:

An exception is raised if Dew.Math.TMtxVecBase.ConditionCheck is True and array borders are overrun.

Overload 2: TMtxVec Log2(TMtxVec X)

Calculate the log base 2 for all X elements.

#	Name	Type	Description
1	X	TMtxVec	source TVec or TMtx

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

Remarks:

Store the results in the calling object. Size and Dew.Math.TMtxVec.Complex properties of the calling vector are set implicitly to match the X object.

Examples

Matrix a = new Matrix();
Matrix x = new Matrix();
x.SetIt(2, 2, false, new double[] { 1.0, 2.0, 4.0, 10.0 });
a.Log2(x);
Matrix expected = new Matrix();
expected.SetIt(2, 2, false, new double[] { 0.0, 1.0, 2.0, 3.32192809488736 });
if (!a.IsEqual(expected, 1e-10, TCompare.cmpAbsolute))
    throw new Exception("Matrix.Log2: mismatch");

Indexed: TMtxVec Log2(TMtxVec X, Int32 XIndex, Int32 Index, Int32 Len)

Calculate the log base 2 for X elements [XIndex]..[XIndex+Len-1].

#	Name	Type	Description
1	X	TMtxVec	source TVec or TMtx
2	XIndex	Int32	X start index
3	Index	Int32	start index
4	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.