Peakstruct

Purpose

Makes an empty standard peak definition structure.

Synopsis

peakdef = peakstruct(fun,n)

Description

The output of PEAKSTRUCT is an empty standard peak structure, or multi-record peak structure.

No input is required. Optional inputs can be used to create different types of default peak definitions in each of the structure records.

Optional Inputs

• fun = Peak function name {default = 'Gaussian'}. Available peak names (shapes) are:

• 'Gaussian', 'Lorentzian', 'PVoigt1', and 'PVoigt2'.

• n = Number of records to include in the (peakdef) structure.

Outputs

• peakdef = A structure array with the following fields:

• name: 'Peak', indentifies (peakdef) as a peak definition structure.

• id: integer or character string peak identifier.

• fun: peak function name {e.g.'Gaussian'}.

• param: vector of parameters for each peak function:

• fun = 'Gaussian'; param = [height, position, width].

• fun = 'Lorenzian'; param = [height, position, width].

• fun = 'PVoigt1'; param = [height, position, width, fraction Gaussian], where 0 fraction Gaussian 1.

• fun = 'PVoigt2'; param = [height, position, width, fraction Gaussian], where 0 fraction Gaussian 1.

• Descriptions of the functions and parameters are given in the Algorithm section of the FITPEAKS entry in the reference manual. Also see PEAKFUNCTION.

• lb: vector of lower bounds on (.param).

• penlb: vector of penalties for lower bounds. If an entry is 0, then the corresponding lower bound is not active.

• ub: vector of upper bounds on (.param).

• penub: vector of penalties for upper bounds. If an entry is 0, then the corresponding upper bound is not active.

Examples

peakdef = peakstruct(,3);

disp(peakdef(2))

peakdef(2) = peakstruct('PVoigt1');

peakdef(2).id = '2: Voigt';

disp(peakdef(2))

See Also

fitpeaks, peakfunction, peakgaussian, peaklorentzian, peakstruct, peakpvoigt1, peakpvoigt2