db1val_alt Subroutine

private pure subroutine db1val_alt(xval, idx, tx, nx, n, kx, bcoef, f, iflag, inbvx, w0, extrap)

Alternate version of db1val_default for use with db1ink_alt and db1ink_alt_2.

Arguments

Type IntentOptional Attributes Name
real(kind=wp), intent(in) :: xval

coordinate of evaluation point.
integer(kind=ip), intent(in) :: idx

derivative of piecewise polynomial to evaluate.
real(kind=wp), intent(in), dimension(n+kx) :: tx

sequence of knots defining the piecewise polynomial in the direction.
integer(kind=ip), intent(in) :: nx

the number of interpolation points in .
integer(kind=ip), intent(in) :: n

length of bcoef: nx+2
integer(kind=ip), intent(in) :: kx

order of polynomial pieces in . (same as in last call to db1ink)
real(kind=wp), intent(in), dimension(n) :: bcoef

the b-spline coefficients computed by db1ink.
real(kind=wp), intent(out) :: f

interpolated value
integer(kind=ip), intent(out) :: iflag

status flag:

  • : no errors
  • : error
integer(kind=ip), intent(inout) :: inbvx

initialization parameter which must be set to 1 the first time this routine is called, and must not be changed by the user.
real(kind=wp), intent(inout), dimension(3_ip*kx) :: w0

work array
logical, intent(in), optional :: extrap

if extrapolation is allowed (if not present, default is False)

Calls

proc~~db1val_alt~~CallsGraph proc~db1val_alt bspline_sub_module::db1val_alt proc~check_value bspline_sub_module::check_value proc~db1val_alt->proc~check_value proc~dbvalu bspline_sub_module::dbvalu proc~db1val_alt->proc~dbvalu proc~dintrv bspline_sub_module::dintrv proc~dbvalu->proc~dintrv proc~get_temp_x_for_extrap bspline_sub_module::get_temp_x_for_extrap proc~dintrv->proc~get_temp_x_for_extrap

Called by

proc~~db1val_alt~~CalledByGraph proc~db1val_alt bspline_sub_module::db1val_alt interface~db1val bspline_sub_module::db1val interface~db1val->proc~db1val_alt proc~evaluate_1d bspline_oo_module::bspline_1d%evaluate_1d proc~evaluate_1d->interface~db1val

Source Code

    pure subroutine db1val_alt(xval,idx,tx,nx,n,kx,bcoef,f,iflag,inbvx,w0,extrap)

    implicit none

    real(wp),intent(in)                  :: xval     !! \(x\) coordinate of evaluation point.
    integer(ip),intent(in)               :: idx      !! \(x\) derivative of piecewise polynomial to evaluate.
    integer(ip),intent(in)               :: nx       !! the number of interpolation points in \(x\).
    integer(ip),intent(in)               :: n        !! length of `bcoef`: `nx+2`
    integer(ip),intent(in)               :: kx       !! order of polynomial pieces in \(x\).
                                                     !! (same as in last call to [[db1ink]])
    real(wp),dimension(n+kx),intent(in)  :: tx       !! sequence of knots defining the piecewise polynomial
                                                     !! in the \(x\) direction.
    real(wp),dimension(n),intent(in)     :: bcoef    !! the b-spline coefficients computed by [[db1ink]].
    real(wp),intent(out)                 :: f        !! interpolated value
    integer(ip),intent(out)              :: iflag    !! status flag:
                                                     !!
                                                     !! * \( = 0 \)   : no errors
                                                     !! * \( \ne 0 \) : error
    integer(ip),intent(inout)            :: inbvx    !! initialization parameter which must be set
                                                     !! to 1 the first time this routine is called,
                                                     !! and must not be changed by the user.
    real(wp),dimension(3_ip*kx),intent(inout) :: w0  !! work array
    logical,intent(in),optional          :: extrap   !! if extrapolation is allowed
                                                     !! (if not present, default is False)

    f = 0.0_wp

    iflag = check_value(xval,tx,1_ip,extrap); if (iflag/=0_ip) return

    call dbvalu(tx,bcoef,n,kx,idx,xval,inbvx,w0,iflag,f,extrap)

    end subroutine db1val_alt