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2ae2672ee9
Fixing dep build script on Windows and removing some warnings. Use bundled igl by default. Not building with the dependency scripts if not explicitly stated. This way, it will stay in Fix the libigl patch to include C source files in header only mode.
71 lines
2.1 KiB
C++
71 lines
2.1 KiB
C++
#ifndef IGL_REDUX_H
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#define IGL_REDUX_H
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#include <Eigen/Core>
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#include <Eigen/Sparse>
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namespace igl
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{
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// REDUX Perform reductions on the rows or columns of a SparseMatrix. This is
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// _similar_ to DenseBase::redux, but different in two important ways:
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// 1. (unstored) Zeros are **not** "visited", however if the first element
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// in the column/row does not appear in the first row/column then the
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// reduction is assumed to start with zero. In this way, "any", "all",
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// "count"(non-zeros) work as expected. This means it is **not** possible
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// to use this to count (implicit) zeros.
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// 2. This redux is more powerful in the sense that A and B may have
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// different types. This makes it possible to count the number of
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// non-zeros in a SparseMatrix<bool> A into a VectorXi B.
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//
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// Inputs:
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// A m by n sparse matrix
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// dim dimension along which to sum (1 or 2)
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// func function handle with the prototype `X(Y a, I i, J j, Z b)` where a
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// is the running value, b is A(i,j)
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// Output:
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// S n-long sparse vector (if dim == 1)
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// or
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// S m-long sparse vector (if dim == 2)
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template <typename AType, typename Func, typename DerivedB>
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inline void redux(
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const Eigen::SparseMatrix<AType> & A,
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const int dim,
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const Func & func,
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Eigen::PlainObjectBase<DerivedB> & B);
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}
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// Implementation
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#include "redux.h"
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#include "for_each.h"
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template <typename AType, typename Func, typename DerivedB>
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inline void igl::redux(
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const Eigen::SparseMatrix<AType> & A,
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const int dim,
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const Func & func,
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Eigen::PlainObjectBase<DerivedB> & B)
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{
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assert((dim == 1 || dim == 2) && "dim must be 2 or 1");
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// Get size of input
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int m = A.rows();
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int n = A.cols();
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// resize output
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B = DerivedB::Zero(dim==1?n:m);
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const auto func_wrap = [&func,&B,&dim](const int i, const int j, const int v)
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{
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if(dim == 1)
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{
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B(j) = i == 0? v : func(B(j),v);
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}else
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{
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B(i) = j == 0? v : func(B(i),v);
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}
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};
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for_each(A,func_wrap);
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}
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//#ifndef IGL_STATIC_LIBRARY
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//# include "redux.cpp"
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//#endif
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#endif
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