stellinstall/spgrid_8f_source.html

      subroutine spgrid(x_newgrid,nx_new,f_new,nx,xpkg,fspl,iwarn,ier)

c

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

c  to a new grid, given by x_newgrid.

c

c  set warning flag if the range x_newgrid exceeds the range of the

c  original xpkg.

c

c  (xpkg -- see genxpkg subroutine)

c

c  input:

c

      real x_newgrid(nx_new)            ! new grid

c

c  output:

c

      real f_new(nx_new)                ! f evaluated on this grid

c

c  input:

c

      integer nx                        ! size of old grid

      real xpkg(nx,4)                   ! old grid "package"

      real fspl(4,nx)                   ! 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

      integer ict(3)

c

      data ict/1,0,0/

c

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

c

      call spvec(ict,nx_new,x_newgrid,nx_new,f_new,nx,xpkg,fspl,

     >   iwarn,ier)

c

      return

      end