FitSinglePeak2: Performs a peak fit (Initial values as vector).

In pasturm/TofDaqR: R Interface to the TOFWERK TofDaq API

Performs a peak fit (Initial values as vector).

Description

FitSinglePeak2 performs a peak fit. Gaussian, Lorentzian and Pseudo-Voigt peak shapes are supported.

Usage

FitSinglePeak2(
  yVals,
  xVals,
  peakType = 0L,
  param = as.numeric(c(0, 0, 0, 0, 0, 0, 0))
)

Arguments

yVals	y axis data.
xVals	x axis data.
peakType	peak model to use.
param	Vector of initial values (blOffset, blSlope, amplitude, fwhmLo, fwhmHi, peakPos, mu).

Details

Same as FitSinglePeak, but takes the initial values of the fit parameter as a vector argument instead of explicit parameters. Peak parameters are optimized using a Levenberg-Marquardt algorithm as implemented by the library lmfit. The following peak types are available:

peak type index	peak function	symmetric	baseline
-1	Gaussian through highest point and its neighbours	yes	no
0	Gaussian	yes	no
1	Lorentzian	yes	no
2	Pseudo-Voigt	yes	no
3	Gaussian	yes	yes
4	Lorentzian	yes	yes
5	Pseudo-Voigt	yes	yes
6	Gaussian	no	no
7	Lorentzian	no	no
8	Pseudo-Voigt	no	no
9	Gaussian	no	yes
10	Lorentzian	no	yes
11	Pseudo-Voigt	no	yes

The function for peakType = -1 is not an actual peak fit but rather the Gaussian function (symmetric, no baseline) defined by the maximum intensity point and its neighbors. It is used to automatically generate guess values for position, width and amplitude if all peak parameters are set to 0.

Value

List with peak parameters.

See Also

Other Peak fitting functions: EvalMultiPeak(), EvalSinglePeak(), FitSinglePeak(), MultiPeakFit()

pasturm/TofDaqR documentation built on March 29, 2024, 12:10 a.m.