import park,numpy class SansParameter(park.Parameter): """ SANS model parameters for use in the PARK fitting service. The parameter attribute value is redirected to the underlying parameter value in the SANS model. """ def __init__(self, name, model): """ @param name: the name of the model parameter @param model: the sans model to wrap as a park model """ self._model, self._name = model,name #set the value for the parameter of the given name self.set(model.getParam(name)) def _getvalue(self): """ override the _getvalue of park parameter @return value the parameter associates with self.name """ return self._model.getParam(self.name) def _setvalue(self,value): """ override the _setvalue pf park parameter @param value: the value to set on a given parameter """ self._model.setParam(self.name, value) value = property(_getvalue,_setvalue) def _getrange(self): """ Override _getrange of park parameter return the range of parameter """ lo,hi = self._model.details[self.name][1:] if lo is None: lo = -numpy.inf if hi is None: hi = numpy.inf return lo,hi def _setrange(self,r): """ override _setrange of park parameter @param r: the value of the range to set """ self._model.details[self.name][1:] = r range = property(_getrange,_setrange) class Model(park.Model): """ PARK wrapper for SANS models. """ def __init__(self, sans_model, **kw): """ @param sans_model: the sans model to wrap using park interface """ park.Model.__init__(self, **kw) self.model = sans_model self.name = sans_model.name #list of parameters names self.sansp = sans_model.getParamList() #list of park parameter self.parkp = [SansParameter(p,sans_model) for p in self.sansp] #list of parameterset self.parameterset = park.ParameterSet(sans_model.name,pars=self.parkp) self.pars=[] def getParams(self,fitparams): """ return a list of value of paramter to fit @param fitparams: list of paramaters name to fit """ list=[] self.pars=[] self.pars=fitparams for item in fitparams: for element in self.parkp: if element.name ==str(item): list.append(element.value) return list def setParams(self,paramlist, params): """ Set value for parameters to fit @param params: list of value for parameters to fit """ try: for i in range(len(self.parkp)): for j in range(len(paramlist)): if self.parkp[i].name==paramlist[j]: self.parkp[i].value = params[j] self.model.setParam(self.parkp[i].name,params[j]) except: raise def eval(self,x): """ override eval method of park model. @param x: the x value used to compute a function """ return self.model.runXY(x) class Data(object): """ Wrapper class for SANS data """ def __init__(self,x=None,y=None,dy=None,dx=None,sans_data=None): """ Data can be initital with a data (sans plottable) or with vectors. """ if sans_data !=None: self.x= sans_data.x self.y= sans_data.y self.dx= sans_data.dx self.dy= sans_data.dy elif (x!=None and y!=None and dy!=None): self.x=x self.y=y self.dx=dx self.dy=dy else: raise ValueError,\ "Data is missing x, y or dy, impossible to compute residuals later on" self.qmin=None self.qmax=None def setFitRange(self,mini=None,maxi=None): """ to set the fit range""" self.qmin=mini self.qmax=maxi def getFitRange(self): """ @return the range of data.x to fit """ return self.qmin, self.qmax def residuals(self, fn): """ @param fn: function that return model value @return residuals """ x,y,dy = [numpy.asarray(v) for v in (self.x,self.y,self.dy)] if self.qmin==None and self.qmax==None: fx =numpy.asarray([fn(v) for v in x]) return (y - fx)/dy else: idx = (x>=self.qmin) & (x <= self.qmax) fx = numpy.asarray([fn(item)for item in x[idx ]]) return (y[idx] - fx)/dy[idx] def residuals_deriv(self, model, pars=[]): """ @return residuals derivatives . @note: in this case just return empty array """ return [] class sansAssembly: """ Sans Assembly class a class wrapper to be call in optimizer.leastsq method """ def __init__(self,paramlist,Model=None , Data=None): """ @param Model: the model wrapper fro sans -model @param Data: the data wrapper for sans data """ self.model = Model self.data = Data self.paramlist=paramlist self.res=[] def chisq(self, params): """ Calculates chi^2 @param params: list of parameter values @return: chi^2 """ sum = 0 for item in self.res: sum += item*item return sum def __call__(self,params): """ Compute residuals @param params: value of parameters to fit """ self.model.setParams(self.paramlist,params) self.res= self.data.residuals(self.model.eval) return self.res class FitEngine: def __init__(self): """ Base class for scipy and park fit engine """ #List of parameter names to fit self.paramList=[] #Dictionnary of fitArrange element (fit problems) self.fitArrangeDict={} def _concatenateData(self, listdata=[]): """ _concatenateData method concatenates each fields of all data contains ins listdata. @param listdata: list of data @return Data: Data is wrapper class for sans plottable. it is created with all parameters of data concatenanted @raise: if listdata is empty will return None @raise: if data in listdata don't contain dy field ,will create an error during fitting """ if listdata==[]: raise ValueError, " data list missing" else: xtemp=[] ytemp=[] dytemp=[] self.mini=None self.maxi=None for data in listdata: mini,maxi=data.getFitRange() if self.mini==None and self.maxi==None: self.mini=mini self.maxi=maxi else: if mini < self.mini: self.mini=mini if self.maxi < maxi: self.maxi=maxi for i in range(len(data.x)): xtemp.append(data.x[i]) ytemp.append(data.y[i]) if data.dy is not None and len(data.dy)==len(data.y): dytemp.append(data.dy[i]) else: raise RuntimeError, "Fit._concatenateData: y-errors missing" data= Data(x=xtemp,y=ytemp,dy=dytemp) data.setFitRange(self.mini, self.maxi) return data def set_model(self,model,Uid,pars=[]): """ set a model on a given uid in the fit engine. @param model: the model to fit @param Uid :is the key of the fitArrange dictionnary where model is saved as a value @param pars: the list of parameters to fit @note : pars must contains only name of existing model's paramaters """ if len(pars) >0: if model==None: raise ValueError, "AbstractFitEngine: Specify parameters to fit" else: for item in pars: if item in model.model.getParamList(): self.paramList.append(item) else: raise ValueError,"wrong paramter %s used to set model %s. Choose\ parameter name within %s"%(item, model.model.name,str(model.model.getParamList())) return #A fitArrange is already created but contains dList only at Uid if self.fitArrangeDict.has_key(Uid): self.fitArrangeDict[Uid].set_model(model) else: #no fitArrange object has been create with this Uid fitproblem = FitArrange() fitproblem.set_model(model) self.fitArrangeDict[Uid] = fitproblem else: raise ValueError, "park_integration:missing parameters" def set_data(self,data,Uid,qmin=None,qmax=None): """ Receives plottable, creates a list of data to fit,set data in a FitArrange object and adds that object in a dictionary with key Uid. @param data: data added @param Uid: unique key corresponding to a fitArrange object with data """ if qmin !=None and qmax !=None: data.setFitRange(mini=qmin,maxi=qmax) #A fitArrange is already created but contains model only at Uid if self.fitArrangeDict.has_key(Uid): self.fitArrangeDict[Uid].add_data(data) else: #no fitArrange object has been create with this Uid fitproblem= FitArrange() fitproblem.add_data(data) self.fitArrangeDict[Uid]=fitproblem def get_model(self,Uid): """ @param Uid: Uid is key in the dictionary containing the model to return @return a model at this uid or None if no FitArrange element was created with this Uid """ if self.fitArrangeDict.has_key(Uid): return self.fitArrangeDict[Uid].get_model() else: return None def remove_Fit_Problem(self,Uid): """remove fitarrange in Uid""" if self.fitArrangeDict.has_key(Uid): del self.fitArrangeDict[Uid] def select_problem_for_fit(self,Uid,value): """ select a couple of model and data at the Uid position in dictionary and set in self.selected value to value @param value: the value to allow fitting. can only have the value one or zero """ if self.fitArrangeDict.has_key(Uid): self.fitArrangeDict[Uid].set_to_fit( value) def get_problem_to_fit(self,Uid): """ return the self.selected value of the fit problem of Uid @param Uid: the Uid of the problem """ if self.fitArrangeDict.has_key(Uid): self.fitArrangeDict[Uid].get_to_fit() class FitArrange: def __init__(self): """ Class FitArrange contains a set of data for a given model to perform the Fit.FitArrange must contain exactly one model and at least one data for the fit to be performed. model: the model selected by the user Ldata: a list of data what the user wants to fit """ self.model = None self.dList =[] #self.selected is zero when this fit problem is not schedule to fit #self.selected is 1 when schedule to fit self.selected = 0 def set_model(self,model): """ set_model save a copy of the model @param model: the model being set """ self.model = model def add_data(self,data): """ add_data fill a self.dList with data to fit @param data: Data to add in the list """ if not data in self.dList: self.dList.append(data) def get_model(self): """ @return: saved model """ return self.model def get_data(self): """ @return: list of data dList""" return self.dList def remove_data(self,data): """ Remove one element from the list @param data: Data to remove from dList """ if data in self.dList: self.dList.remove(data) def set_to_fit (self, value=0): """ set self.selected to 0 or 1 for other values raise an exception @param value: integer between 0 or 1 """ self.selected= value def get_to_fit(self): """ @return self.selected value """ return self.selected