RegModels.PowerEval Method

Overload List

#	Signature	Description
1	void PowerEval(TVec B, TVec X, TVec YHat)	Evaluate power function model (vectorized version).
2	void PowerEval(Double[] B, TVec X, TVec YHat)	Evaluates b[0]*X^b[1] for given values in X vector, parameters in B array, and returns the results in XHat vector.
3	Double PowerEval(Double[] B, Double X)	Evaluates power function.

Overload 1: void PowerEval(TVec B, TVec X, TVec YHat)

Evaluate power function model (vectorized version).

#	Name	Type	Description
1	B	TVec	source TVec
2	X	TVec	source TVec
3	YHat	TVec	source TVec

Result: stored in self (calling object)

Overload 2: void PowerEval(Double[] B, TVec X, TVec YHat)

Evaluates b[0]*X^b[1] for given values in X vector, parameters in B array, and returns the results in XHat vector.

#	Name	Type	Description
1	B	Double[]
2	X	TVec	source TVec
3	YHat	TVec	source TVec

Result: stored in self (calling object)

Remarks:

Size and Complex properties of XHat vector are adjusted automatically.

Note
Use this version if you want to evaluate power function for multiple values at the same time. This is a lot faster than calling single value version for each x value.

Examples

using Dew.Math;
using Dew.Stats.Units;
namespace Dew.Examples
{
    private void Example()
    {
        Vector X = new Vector(100,false);
        Vector Y = new Vector(0);
        X.Ramp(-5.0, 0.1);
        RegModels.PowerEval(new double[] {1.0, 3.0}, X, Y);
    }
}

See Also: RegModels.PowerDeriv, RegModels.PowerFit

Overload 3: Double PowerEval(Double[] B, Double X)

Evaluates power function.

#	Name	Type	Description
1	B	Double[]
2	X	Double	scalar

Returns: Double - b[0]*X^b[1] for given value X and parameters in B array.

Examples

using Dew.Math;
using Dew.Stats.Units;
namespace Dew.Examples
{
    private void Example()
    {
        y = RegModels.PowerEval(new double[] {-5,3.5},2.0);
    }
}