Changeset acb8788 in sasview

Timestamp:

May 21, 2008 11:11:48 AM (17 years ago)

Author:

Gervaise Alina <gervyh@…>

Branches:

master, ESS_GUI, ESS_GUI_Docs, ESS_GUI_batch_fitting, ESS_GUI_bumps_abstraction, ESS_GUI_iss1116, ESS_GUI_iss879, ESS_GUI_iss959, ESS_GUI_opencl, ESS_GUI_ordering, ESS_GUI_sync_sascalc, costrafo411, magnetic_scatt, release-4.1.1, release-4.1.2, release-4.2.2, release_4.0.1, ticket-1009, ticket-1094-headless, ticket-1242-2d-resolution, ticket-1243, ticket-1249, ticket885, unittest-saveload

Children:

c14c503

Parents:

93c2ef2

Message:

mod

File:

• park_integration/test/FittingModule.py (modified) (2 diffs)

park_integration/test/FittingModule.py

@@ -1 +1 @@
 #class Fitting
-from sans.guitools.fittings import Parameter
-import sans.guitools.fittings
+from sans.guitools.plottables import Data1D
+from Loader import Load
+from scipy import optimize
 class Fitting:
     """ 
         Performs the Fit.he user determine what kind of data 
     """
-    def __init__(self,data1,data2=None):
-        self.model = ""
-        self.data1 = data1
-        self.data2= data2
+    def __init__(self,data=[]):
+        #self.model is a list of all models to fit
+        self.model=[]
+        #the list of all data to fit 
+        self.data = data
+        #dictionary of models parameters
+        self.parameters={}
         self.contraint =None
+        self.residuals=[]
         
     def fit_engine(self):
@@ -17 +22 @@
         """
         return True
-    def fit(self):
+    def fit(self,pars, qmin=None, qmax=None):
         """
              Do the fit 
         """
-          
-        #Display the fittings values
-        self.default_A = self.model.getParam('A') 
-        self.default_B = self.model.getParam('B') 
-        self.cstA = Parameter(self.model, 'A', self.default_A)
-        self.cstB  = Parameter(self.model, 'B', self.default_B)
-        xmin= min(self.data1.x)
-        xmax= max(self.data1.x)
-        
-        chisqr, out, cov = sans.guitools.fittings.sansfit(self.model, 
-        [self.cstA, self.cstB],self.data1.x, self.data1.y,self.data1.dy,xmin,xmax)
-        
+        
+        # Do the fit with 2 data set and one model 
+        numberData= len(self.data)
+        numberModel= len(self.model)
+        if numberData==1 and numberModel==1:
+            if qmin==None:
+                xmin= min(self.data[0].x)
+            if qmax==None:
+                xmax= max(self.data[0].x)
+           
+            #chisqr, out, cov = fitHelper(self.model[0],self.data[0],pars,xmin,xmax)
+            chisqr, out, cov =fitHelper(self.model[0], pars, self.data[0].x,
+                                 self.data[0].y, self.data[0].dy ,xmin,xmax)
+        else:# More than one data to fit with one model
+            xtemp=[]
+            ytemp=[]
+            dytemp=[]
+            for data in self.data:
+                for i in range(len(data.x)):
+                    if not data.x[i] in xtemp:
+                        xtemp.append(data.x[i])
+                       
+                    if not data.y[i] in ytemp:
+                        ytemp.append(data.y[i])
+                        
+                    if not data.dy[i] in dytemp:
+                        dytemp.append(data.dy[i])
+            if qmin==None:
+                xmin= min(xtemp)
+            if qmax==None:
+                xmax= max(xtemp)      
+            #chisqr, out, cov = fitHelper(self.model[0], 
+            #temp,pars,min(temp.x),max(temp.x))
+            chisqr, out, cov =fitHelper(self.model[0], pars, xtemp,
+                                 ytemp, dytemp ,xmin,xmax)
         return chisqr, out, cov
     
     def set_model(self,model):
         """ Set model """
-        self.model = model
-        
-    
-    def set_data(self,x,y,dx,dy):
-        """ Receive values from Loader class and set plottable variables"""
-        self.data1.x = x
-        self.data1.y = y
-        self.data1.dx= dx
-        self.data1.dy= dy
+        self.model.append(model)
+        
+    def set_data(self,data):
+        """ Receive plottable and create a list of data to fit"""
+        self.data.append(data)
+        
     def get_data(self):
-        """ return data"""
-        return self.data1
+        """ return list of data"""
+        return self.data
     
     def add_contraint(self, contraint):
         """ User specify contraint to fit """
         self.contraint = str(contraint)
+        
     def get_contraint(self):
         """ return the contraint value """
         return self.contraint
-        
-    
+    
+def get_residuals(model,data,qmin=None,qmax=None):
+    """
+        Calculates the vector of residuals for each point 
+        in y for a given set of input parameters.
+        @param params: list of parameter values
+        @return: vector of residuals
+    """
+    residuals = []
+   
+    for j in range(len(data.x)):
+        if data.x[j]> qmin and data.x[j]< qmax:
+            residuals.append( ( data.y[j] - model.runXY(data.x[j]) ) / data.dy[j])
+    
+    return residuals
+
+   
+def chi2(params): 
+    """
+        Calculates chi^2
+        @param params: list of parameter values
+        @return: chi^2
+    """
+    sum = 0
+    res = get_residuals(params)
+    for item in res:
+        sum += item*item
+    return sum 
+    
+    
+    def residual(self):
+        return self.residuals
+    
+def fitHelper(model,data,pars,qmin=None,qmax=None):
+    """ Do the actual fitting"""
+    
+    p = [param() for param in pars]
+    out, cov_x, info, mesg, success = optimize.leastsq(get_residuals, p, full_output=1, warning=True)
+    print info, mesg, success
+    # Calculate chi squared
+    if len(pars)>1:
+        chisqr = self.chi2(out)
+    elif len(pars)==1:
+        chisqr = self.chi2([out])
+        
+    return chisqr, out, cov_x
+
+class Parameter:
+    """
+        Class to handle model parameters
+    """
+    def __init__(self, model, name, value=None):
+            self.model = model
+            self.name = name
+            if not value==None:
+                self.model.setParam(self.name, value)
+           
+    def set(self, value):
+        """
+            Set the value of the parameter
+        """
+        self.model.setParam(self.name, value)
+
+    def __call__(self):
+        """ 
+            Return the current value of the parameter
+        """
+        return self.model.getParam(self.name)
+    
+def fitHelper(model, pars, x, y, err_y ,qmin=None, qmax=None):
+    """
+        Fit function
+        @param model: sans model object
+        @param pars: list of parameters
+        @param x: vector of x data
+        @param y: vector of y data
+        @param err_y: vector of y errors 
+    """
+    def f(params):
+        """
+            Calculates the vector of residuals for each point 
+            in y for a given set of input parameters.
+            @param params: list of parameter values
+            @return: vector of residuals
+        """
+        i = 0
+        for p in pars:
+            p.set(params[i])
+            i += 1
+        
+        residuals = []
+        for j in range(len(x)):
+            if x[j]>qmin and x[j]<qmax:
+                residuals.append( ( y[j] - model.runXY(x[j]) ) / err_y[j] )
+       
+        return residuals
+        
+    def chi2(params):
+        """
+            Calculates chi^2
+            @param params: list of parameter values
+            @return: chi^2
+        """
+        sum = 0
+        res = f(params)
+        for item in res:
+            sum += item*item
+        return sum
+        
+    p = [param() for param in pars]
+    out, cov_x, info, mesg, success = optimize.leastsq(f, p, full_output=1, warning=True)
+    print info, mesg, success
+    # Calculate chi squared
+    if len(pars)>1:
+        chisqr = chi2(out)
+    elif len(pars)==1:
+        chisqr = chi2([out])
+        
+    return chisqr, out, cov_x    
+
+      
+if __name__ == "__main__": 
+    load= Load()
+    
+    # test fit one data set one model
+    load.set_filename("testdata_line.txt")
+    load.set_values()
+    data1 = Data1D(x=[], y=[], dx=None,dy=None)
+    data1.name = "data1"
+    load.load_data(data1)
+    Fit =Fitting()
+    Fit.set_data(data1)
+    from sans.guitools.LineModel import LineModel
+    model  = LineModel()
+    Fit.set_model(model)
+    
+    default_A = model.getParam('A') 
+    default_B = model.getParam('B') 
+    cstA = Parameter(model, 'A', default_A)
+    cstB  = Parameter(model, 'B', default_B)
+    
+    chisqr, out, cov=Fit.fit([cstA,cstB],None,None)
+    print"fit only one data",chisqr, out, cov 
+    
+    # test fit with 2 data and one model
+    load.set_filename("testdata1.txt")
+    load.set_values()
+    data2 = Data1D(x=[], y=[], dx=None,dy=None)
+    data2.name = "data2"
+    
+    load.load_data(data2)
+    Fit.set_data(data2)
+    
+    load.set_filename("testdata2.txt")
+    load.set_values()
+    data3 = Data1D(x=[], y=[], dx=None,dy=None)
+    data3.name = "data2"
+    load.load_data(data3)
+    Fit.set_data(data3)
+    chisqr, out, cov=Fit.fit([cstA,cstB],None,None)
+    print"fit two data",chisqr, out, cov