```    Program e02dffe

!     E02DFF Example Program Text

!     Mark 26.1 Release. NAG Copyright 2017.

!     .. Use Statements ..
Use nag_library, Only: e02dff, nag_wp, x04cbf
!     .. Implicit None Statement ..
Implicit None
!     .. Parameters ..
Integer, Parameter               :: indent = 0, ncols = 80, nin = 5,     &
nout = 6
Character (1), Parameter         :: chlabel = 'C', diag = 'N',           &
matrix = 'G'
Character (4), Parameter         :: form = 'F8.3'
!     .. Local Scalars ..
Integer                          :: ifail, liwrk, lwrk, mx, my, px, py
Character (48)                   :: title
!     .. Local Arrays ..
Real (Kind=nag_wp), Allocatable  :: c(:), ff(:), lamda(:), mu(:),        &
wrk(:), x(:), y(:)
Integer, Allocatable             :: iwrk(:)
Character (10), Allocatable      :: clabs(:), rlabs(:)
!     .. Intrinsic Procedures ..
Intrinsic                        :: min
!     .. Executable Statements ..
Write (nout,*) 'E02DFF Example Program Results'
Flush (nout)

!     Skip heading in data file

!     Read PX and PY, the number of knots in the X and Y directions.

Allocate (lamda(px),mu(py),c((px-4)*(py-4)))

!     Read the knots LAMDA(1) .. LAMDA(PX) and MU(1) .. MU(PY).

!     Read C, the bicubic spline coefficients.

!     Read MX and MY, the number of grid points in the X and Y
!     directions respectively.

lwrk = min(4*mx+px,4*my+py)
liwrk = mx + px - 4
Allocate (clabs(mx),rlabs(my),x(mx),y(my),ff(mx*my),wrk(lwrk),           &
iwrk(liwrk))

!     Read the X and Y co-ordinates defining the evaluation grid.

!     Evaluate the spline at the MX by MY points.

ifail = 0
Call e02dff(mx,my,px,py,x,y,lamda,mu,c,ff,wrk,lwrk,iwrk,liwrk,ifail)

!     Generate column and row labels to print the results with.

Write (clabs(1:mx),99999) x(1:mx)
Write (rlabs(1:my),99999) y(1:my)

Write (nout,*)
Flush (nout)

!     Print the result array.
title = 'Spline evaluated on X-Y grid (X across, Y down):'
Call x04cbf(matrix,diag,my,mx,ff,my,form,title,chlabel,rlabs,chlabel,    &
clabs,ncols,indent,ifail)

99999 Format ((F5.1))
End Program e02dffe
```