e02dff

Purpose

Synopsis

[ff,ifail] = e02dff(x,y,lamda,mu,c<,ifail>)

Description

 
 This routine calculates values of the bicubic spline s(x,y) on a 
 rectangular grid of points in the x-y plane, from its augmented 
 knot sets {(lambda)} and {(mu)} and from the coefficients c  , 
                                                            ij 
 for i=1,2,...,PX-4; j=1,2,...,PY-4, in its B-spline 
 representation
 
                             --          
                     s(x,y)= > c  M (x)N (y).
                             -- ij i    j
                             ij          
 
 Here M (x) and N (y) denote normalised cubic B-splines, the 
       i         j                                          
 former defined on the knots (lambda)  to (lambda)    and the 
                                     i            i+4        
 latter on the knots (mu)  to (mu)   .
                         j        j+4
 
 The points in the grid are defined by co-ordinates x , for 
                                                     q     
 q=1,2,...,m , along the x axis, and co-ordinates y , for 
            x                                      r     
 r=1,2,...,m  along the y axis.
            y             
 
 This routine may be used to calculate values of a bicubic spline 
 given in the form produced by E01DAF, E02DAF, E02DCF and E02DDF. 
 

Parameters

e02dff

Required Input Arguments:

x (:)                                 real
y (:)                                 real
lamda (:)                             real
mu (:)                                real
c (:)                                 real

Optional Input Arguments:                       <Default>

ifail                                 integer  -1

Output Arguments:

ff (:)                                real
ifail                                 integer