void from_eigen(const Eigen::DenseBase<Derived> &in, DoubleField& out) {
assert(out.grid_params().nx == in.rows() && out.grid_params().ny == in.cols());
for (int i = 0; i < in.rows(); ++i) {
for (int j = 0; j < in.cols(); ++j) {
out(i,j) = in(i,j);
}
}
}
IGL_INLINE void igl::find(
const Eigen::DenseBase<DerivedX>& X,
Eigen::PlainObjectBase<DerivedI> & I,
Eigen::PlainObjectBase<DerivedJ> & J,
Eigen::PlainObjectBase<DerivedV> & V)
{
const int nnz = X.count();
I.resize(nnz,1);
J.resize(nnz,1);
V.resize(nnz,1);
{
int k = 0;
for(int j = 0;j<X.cols();j++)
{
for(int i = 0;i<X.rows();i++)
{
if(X(i,j))
{
I(k) = i;
J(k) = j;
V(k) = X(i,j);
k++;
}
}
}
}
}
IGL_INLINE void igl::mat_min(
const Eigen::DenseBase<DerivedX> & X,
const int dim,
Eigen::PlainObjectBase<DerivedY> & Y,
Eigen::PlainObjectBase<DerivedI> & I)
{
assert(dim==1||dim==2);
// output size
int n = (dim==1?X.cols():X.rows());
// resize output
Y.resize(n);
I.resize(n);
// loop over dimension opposite of dim
for(int j = 0;j<n;j++)
{
typename DerivedX::Index PHONY,i;
typename DerivedX::Scalar m;
if(dim==1)
{
m = X.col(j).minCoeff(&i,&PHONY);
}else
{
m = X.row(j).minCoeff(&PHONY,&i);
}
Y(j) = m;
I(j) = i;
}
}
IGL_INLINE void igl::setdiff(
const Eigen::DenseBase<DerivedA> & A,
const Eigen::DenseBase<DerivedB> & B,
Eigen::PlainObjectBase<DerivedC> & C,
Eigen::PlainObjectBase<DerivedIA> & IA)
{
using namespace Eigen;
using namespace std;
// boring base cases
if(A.size() == 0)
{
C.resize(0,1);
IA.resize(0,1);
}
if(B.size() == 0)
{
C.resize(A.size(),1);
int k = 0;
for(int j = 0;j<A.cols();j++)
{
for(int i = 0;i<A.rows();i++)
{
C(k++) = A(i,j);
}
}
assert(k == C.size());
IA = igl::LinSpaced<Eigen::Matrix<typename DerivedIA::Scalar,Eigen::Dynamic,1> >(
C.size(),0,C.size()-1);
}
// Get rid of any duplicates
typedef Matrix<typename DerivedA::Scalar,Dynamic,1> VectorA;
typedef Matrix<typename DerivedB::Scalar,Dynamic,1> VectorB;
VectorA uA;
VectorB uB;
typedef DerivedIA IAType;
IAType uIA,uIuA,uIB,uIuB;
unique(A,uA,uIA,uIuA);
unique(B,uB,uIB,uIuB);
// Sort both
VectorA sA;
VectorB sB;
IAType sIA,sIB;
sort(uA,1,true,sA,sIA);
sort(uB,1,true,sB,sIB);
vector<typename DerivedB::Scalar> vC;
vector<typename DerivedIA::Scalar> vIA;
int bi = 0;
// loop over sA
bool past = false;
for(int a = 0;a<sA.size();a++)
{
while(!past && sA(a)>sB(bi))
{
bi++;
past = bi>=sB.size();
}
if(past || sA(a)<sB(bi))
{
// then sA(a) did not appear in sB
vC.push_back(sA(a));
vIA.push_back(uIA(sIA(a)));
}
}
list_to_matrix(vC,C);
list_to_matrix(vIA,IA);
}