DCSTEPRun Method

public void Run(
	ref double STX,
	ref double FX,
	ref double DX,
	ref double STY,
	ref double FY,
	ref double DY,
	ref double STP,
	double FP,
	double DP,
	ref bool BRACKT,
	double STPMIN,
	double STPMAX
)

Public Sub Run ( 
	ByRef STX As Double,
	ByRef FX As Double,
	ByRef DX As Double,
	ByRef STY As Double,
	ByRef FY As Double,
	ByRef DY As Double,
	ByRef STP As Double,
	FP As Double,
	DP As Double,
	ByRef BRACKT As Boolean,
	STPMIN As Double,
	STPMAX As Double
)

Parameters

STX  Double

is a double precision variable. On entry stx is the best step obtained so far and is an endpoint of the interval that contains the minimizer. On exit stx is the updated best step.

FX  Double

is a double precision variable. On entry fx is the function at stx. On exit fx is the function at stx.

DX  Double

is a double precision variable. On entry dx is the derivative of the function at stx. The derivative must be negative in the direction of the step, that is, dx and stp - stx must have opposite signs. On exit dx is the derivative of the function at stx.

STY  Double

is a double precision variable. On entry sty is the second endpoint of the interval that contains the minimizer. On exit sty is the updated endpoint of the interval that contains the minimizer.

FY  Double

is a double precision variable. On entry fy is the function at sty. On exit fy is the function at sty.

DY  Double

is a double precision variable. On entry dy is the derivative of the function at sty. On exit dy is the derivative of the function at the exit sty.

STP  Double

is a double precision variable. On entry stp is the current step. If brackt is set to .true. then on input stp must be between stx and sty. On exit stp is a new trial step.

FP  Double

is a double precision variable. On entry fp is the function at stp On exit fp is unchanged.

DP  Double

is a double precision variable. On entry dp is the the derivative of the function at stp. On exit dp is unchanged.

BRACKT  Boolean

is an logical variable. On entry brackt specifies if a minimizer has been bracketed. Initially brackt must be set to .false. On exit brackt specifies if a minimizer has been bracketed. When a minimizer is bracketed brackt is set to .true.

STPMIN  Double

is a double precision variable. On entry stpmin is a lower bound for the step. On exit stpmin is unchanged.

STPMAX  Double

is a double precision variable. On entry stpmax is an upper bound for the step. On exit stpmax is unchanged.

Reference