stellinstall/r8gridintrp2d_8f_source.html

      subroutine r8gridintrp2d(

     >   x_newgrid,nx_new,y_newgrid,ny_new,f_new,if1,

     >   nx,xpkg,ny,ypkg,jspline,fspl,icoeff,ixdim,iydim,iwarn,ier)

c

c  regrid a spline function f defined vs. x,y as in xpkg,ypkg

c  to a new grid, given by x_newgrid, y_newgrid

c

c  set warning flag if the range x_newgrid, y_newgrid

c  exceeds the range of the original xpkg,ypkg.

c

c  (xpkg,ypkg -- axis data, see genxpkg subroutine)

c

c  input:

c

!============

! idecl:  explicitize implicit INTEGER declarations:

      IMPLICIT NONE

      INTEGER, PARAMETER :: R8=selected_real_kind(12,100)

      INTEGER ny_new,nx_new,iy

!============

      real*8 x_newgrid(nx_new)            ! new x grid

      real*8 y_newgrid(ny_new)            ! new y grid

c

c  output:

c

      integer if1                       ! 1st dimension of f_new

      REAL*8 f_new(if1,ny_new)            ! f evaluated on this grid

c

c  input:

c

      integer nx                        ! size of old grid

      REAL*8 xpkg(nx,4)                   ! old grid "package"

      integer ny                        ! size of old grid

      real*8 ypkg(ny,4)                   ! old grid "package"

c

      integer jspline(2)                ! interpolation type by dimension

      integer :: icoeff                 ! coefficients per data point

      integer :: ixdim,iydim            ! fspl dimensions

      !  =nx,ny unless zonal step function interpolation is used


      real*8 fspl(icoeff,ixdim,iydim)     ! spline coefficients of f

c

c  output:

c  condition codes, =0 for normal exit

c

      integer iwarn                     ! =1 if new grid points out of range

      integer ier                       ! =1 if there is an argument error

c

c--------------------------------------------

c  local

c

      real*8 ytmp(nx_new)

      integer ict(6)

c

      data ict/1,0,0,0,0,0/

c

c--------------------------------------------

c

      do iy=1,ny_new

         ytmp=y_newgrid(iy)

         call r8vecintrp2d(ict,nx_new,x_newgrid,ytmp,nx_new,f_new(1,iy),

     >      nx,xpkg,ny,ypkg,jspline,fspl,icoeff,ixdim,iydim,iwarn,ier)

      enddo

c

      return

      end