IndexSet<Index1D>
LambdaForEigenvalues(int jmin, int jmax, const Basis1D &basis, T radius, bool with_BSplines)
{
const BSpline<T,Primal,R,CDF> phi = basis.mra.phi;
const Wavelet<T,Primal,R,CDF> psi = basis.psi;
IndexSet<Index1D> Lambda;
int k_left, k_right;
if (with_BSplines) {
for (int j=jmin; j<=jmax; ++j) {
k_left = std::floor(-pow2i<T>(j)*radius-psi.support(0,0).l2);
k_right = std::ceil(pow2i<T>(j)*radius-psi.support(0,0).l1);
for (int k=k_left; k<=k_right; ++k) {
Lambda.insert(Index1D(j,k,XWavelet));
}
}
k_left = int(std::floor(-pow2i<T>(jmin)*radius-phi.support(0,0).l2));
k_right = int(std::ceil( pow2i<T>(jmin)*radius-phi.support(0,0).l1));
for (int k=k_left; k<=k_right; ++k) {
Lambda.insert(Index1D(jmin,k,XBSpline));
}
}
else {
for (int j=jmin; j<=jmax; ++j) {
int k_left, k_right;
if (j>=-6) {
k_left = std::floor(-pow2i<T>(j)*radius-psi.support(0,0).l2);
k_right = std::ceil(pow2i<T>(j)*radius-psi.support(0,0).l1);
if (k_left>=0) cout << "j=" << j << ", k_left=" << k_left << endl;
if (k_right<=0) cout << "j=" << j << ", k_right=" << k_right << endl;
}
else {
k_left = -psi.d-psi.d_;
k_right = psi.d+psi.d_;
}
for (int k=k_left; k<=k_right; ++k) {
Lambda.insert(Index1D(j,k,XWavelet));
}
}
}
return Lambda;
}
