65class TriInterpCoef:
public RefCount {
72 double& coef(
int i,
int j,
int k) {
return coef_[ijk_to_index(i,j,k)];}
73 double& rderiv(
int i,
int j,
int k) {
return rderiv_[ijk_to_index(i,j,k)];}
74 double& sderiv(
int i,
int j,
int k) {
return sderiv_[ijk_to_index(i,j,k)];}
77 ijk_to_index(
int i,
int j,
int k)
81 return (ir*(ir+1)>>1) + j;
85 order_to_nvertex(
int order)
87 return ((order+1)*(order+2)>>1);