calcBasisFunctions static method
Implementation
static List<double> calcBasisFunctions(int span, num u, int p, List<double> U ) {
final List<double> N = List.filled(p+1, 0);
final left = List.filled(p+1, 0.0);
final right = List.filled(p+1, 0.0);
N[0] = 1.0;
for (int j = 1; j <= p; ++ j ) {
left[ j ] = u - U[ span + 1 - j ];
right[ j ] = U[ span + j ] - u;
double saved = 0.0;
for (int r = 0; r < j; ++ r ) {
final rv = right[ r + 1 ];
final lv = left[ j - r ];
final temp = N[ r ] / ( rv + lv );
N[r] = saved + rv * temp;
saved = lv * temp;
}
N[j] = saved;
}
return N;
}