SUBROUTINE D1INTR (FI, ifi, jfi, f, if, jf, fx, fy, fxy, xi, yi,
                          x, y, hx, hy)

ARGUMENTS

OUT

FI(IFI,JFI)  interpolated field                                      real

IN

IFI          x-dimension of array FI                                 integer 
JFI          y-dimension of array FI                                 integer
F(IF,JF)     original field                                          real
IF           x-dimension of array F                                  integer
JF           y-dimension of array F                                  integer
FX(IF,JF)    partial derivative of F with respect to x               real
FY(IF,JF)    partial derivative of F with respect to y               real
FXY(IF,JF)   partial second derivative of F with respect to x and y  real
XI(IFI,JFI)  x location of the values of the interpolated field FI   real
YI(IFI,JFI)  y location of the values of the interpolated field FI   real
X(IF)        x location of the values of the original field F        real
Y(JF)        y location of the values of the original field F        real
HX(IF)       grid-lengths defined by HX(i)=X(i+1)-X(i) i=1,IF-1      real
HY(JF)       grid-lengths defined by HY(i)=Y(i+1)-Y(i) i=1,JF-1      real
  (1,JFI)      (IFI,JFI)  
   +-------------+
   |             | 
   |             |  arrays FI, XI and YI 
   |             |
   |             |
   |             |
   +-------------+
  (1,1)       (IFI,1)
  (1,JF)      (IF,JF)  
   +-------------+
   |             | 
   |             |  arrays F, FX, FY and FXY 
   |             |
   |             |
   |             |
   +-------------+
  (1,1)       (IF,1)

DESCRIPTION

EXAMPLE

SEE ALSO