i_sub_mat_add

interface
private subroutine i_sub_mat_add(self, a, amat, b, bmat)

Type	Intent		Name
class(sll_c_spline_matrix),	intent(inout)	::	self
real(kind=wp),	intent(in)	::	a
class(sll_c_spline_matrix),	intent(in)	::	amat
real(kind=wp),	intent(in)	::	b
class(sll_c_spline_matrix),	intent(in)	::	bmat