RegModels.ExpEval Function

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

Pascal

procedure ExpEval(Const B: Array of double; const X: TVec; const YHat: TVec); overload;

File

RegModels

Description

Size and Complex properties of XHat vector are adjusted automatically.

Notes

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

See Also

ExpDeriv, ExpFit

Example

Evaluate exponential function for multiple values at the same time.

Uses MtxExpr, MtxVecTee, Series, RegModels;
procedure Example(Series1: TLineSeries);
var Y,X: Vector;
begin
  X.Size(100);
  X.Ramp(-5.0, 0.05); // x= -5.0, -4.95, ... -0.05
  // Y = b[0] + b[1]*X
  ExpEval([1,3],X,Y);
  DrawValues(X,Y,Series1,false);
end;

#include "Math387.hpp"
#include "RegModels.hpp"
#include "MtxExpr.hpp"
void __fastcall Example(TLineSeries* Series1);
{
  sVector X,Y;
  X.Size(100,false);
  X.Ramp(-5.0, 0.05); // x= -5.0, -4.95, ... -0.05
  ExpEval(OPENARRAY(double,(3.0, -0.5)),X,Y);
  DrawValues(X,Y,Series1,false);
}

RegModels, Functions, Example, See Also

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