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mantid.fitfunctions — Wrapper class for composite fitting function

Fuller discussion of how this works with the fitting frameworks is described here.

class mantid.fitfunctions.CompositeFunctionWrapper(*args, **kwargs)

Wrapper class for Composite Fitting Function

constrainAll(expressions)

Constrain all parameters according local names in expressions.

Parameters:

expressions – string of expressions

f(name)

get function specified by name, such as “LinearBackground” for the only LinearBackground function or “Gaussian1” for the second Gaussian function.

Parameters:

name – name specifying the function

fixAll(name)

Fix all parameters with the given local name. Every member function must have a parameter of this name.

Parameters:

name – name of parameter

flatten()

Return composite function, equal to self, but with every composite function within replaced by its list of functions, so having a pure list of functions. This makes it possible to index and iterate all the functions and use tieAll() and untieAll(). Not to be used with a mixture of product and sum composite functions, because the arithmetic may no longer be correct. The return value is not independent of self.

getCompositeParameterName(name, index)

get composite parameter name of parameter of given name of member function of given index

getIndexOfFunction(name)

get index of function specified by name, such as “LinearBackground” for the only LinearBackground function or “Gaussian1” for the second Gaussian function.

Parameters:

name – name specifying the function

getParameter(name)

get value of parameter of specified name

Parameters:

name – name of parameter

initByName(name, *args, **kwargs)

intialise composite function of named type. E.g. “ProductFunction” This function would be protected in c++ and should not be called directly except by __init__() functions of this class and subclasses.

Parameters:

• name – name of class calling this.

• args – names of functions in composite function

• kwargs – any parameters or attributes that must be passed to the composite function itself.

tieAll(name)

For each member function, tie the parameter of the given name to the parameter of that name in the first member function. The named parameter must occur in all the member functions.

Parameters:

name – name of parameter

unconstrainAll(name)

Unconstrain all parameters of given local name.

Parameters:

name – local name of parameter

untieAll(name)

Untie all parameters with the given local name. Every member function must have a parameter of this name.

Parameters:

name – local name of parameter

class mantid.fitfunctions.ConvolutionWrapper(*args, **kwargs)

Wrapper class for Convolution Fitting Function

class mantid.fitfunctions.FunctionWrapper(name, params_to_optimize=None, **kwargs)

Wrapper class for Fitting Function

constrain(expressions)

Add constraints

Parameters:

expressions – string of tie expressions

fix(name)

Fix a parameter.

Parameters:

name – name of parameter to be fixed

fixAllParameters()

Fix all parameters.

free(name)

Free a parameter from tie or constraint

Parameters:

name – name of parameter to be freed

property function

Return the underlying IFunction object

getParameterName(index)

Get the name of the parameter of given index

Parameters:

index – index of parameter

property name

Return the name of the function

plot(**kwargs)

Plot the function

Parameters:

workspace – workspace upon whose x values the function is plotted.

tie(*args, **kwargs)

Add ties.

Parameters:

• args – one or more dictionaries of ties

• kwargs – one or more ties

unconstrain(name)

Remove constraints from a parameter

Parameters:

name – name of parameter to be unconstrained

untie(name)

Remove tie from parameter.

Parameters:

name – name of parameter to be untied

untieAllParameters()

Remove ties from all parameters.

mantid.fitfunctions.IFunction1D

alias of _IFunction1DWrapperCreator

class mantid.fitfunctions.MultiDomainFunctionWrapper(*args, **kwargs)

Wrapper class for Multidomain Fitting Function

property nDomains

Return number of domains

class mantid.fitfunctions.ProductFunctionWrapper(*args, **kwargs)

Wrapper class for Product Fitting Function