i_sub_eval_deriv Interface

interface
private pure subroutine i_sub_eval_deriv(self, x, derivs, jmin)

Arguments

Type IntentOptional Attributes Name
class(sll_c_bsplines), intent(in) :: self

B-splines object
real(kind=wp), intent(in) :: x

evaluation point
real(kind=wp), intent(out) :: derivs(:)
integer, intent(out) :: jmin

index of first non-zero B-spline

Description

Evaluate derivative at x of all basis functions with support in local cell derivs[j] = B_j'(x) for jmin <= j <= jmin+degree