analysis: analysis::fitting_toolkit::polynomial

def derivs ( self )

Compute the derivatives.

Reimplemented from fit.

Definition at line 800 of file fitting_toolkit.py.

00800                     :
00801         if self.firstpass: #may get used more than once if weights are not constant, but no need to recompute
00802             self.funcparams=zeros(self.param_count, self.atype)
00803             n=self.pointcount
00804             dd = zeros((n, self.param_count), self.atype)
00805             dd[:,0]=1.0
00806             xc=self.xarray[0,:n]-self.xcenter
00807             for i in range(1,self.param_count):
00808                     dd[:,i]=dd[:,i-1]*xc
00809             self.saved_derivs=dd            
00810         return self.saved_derivs
00811 
    ##