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/*
* File: MtxOps.h
* Author: nomadsoul
*
* Created on 18 novembre 2013, 22.19
*/
#include <blaze/util/Assert.h>
#include <math.h>
#include "MDefs.h"
#ifndef MTXOPS_H
#define MTXOPS_H
class MtxOps {
public:
/* subm = orig(row_idx,col_idx)*/
static inline void submatrix(const SpMat& orig, const DynamicVector<size_t>& row_idx, const DynamicVector<size_t>& col_idx, SpMat & subm) {
//Resize senza preservare gli eventuali elementi
subm.resize(row_idx.size(), col_idx.size(), false);
for (size_t i = 0; i < orig.rows(); i++) {
subm.reserve(i, orig.nonZeros(i));
for (DynamicVector<size_t>::ConstIterator crows = row_idx.begin();
crows != row_idx.end(); crows++) {
size_t j = 0;
for (DynamicVector<size_t>::ConstIterator fcol = col_idx.begin();
fcol != col_idx.end(); fcol++) {
subm.append(i, j++, orig((*crows), (*fcol)));
}
}
subm.finalize(i);
}
};
/* subm = orig(row_idx,col_idx)*/
static inline void submatrix(const DMat& orig, const DynamicVector<size_t>& row_idx, const DynamicVector<size_t>& col_idx, DMat & subm) {
//Resize senza preservare gli eventuali elementi
subm.resize(row_idx.size(), col_idx.size(), false);
for (size_t i = 0; i < orig.rows(); i++) {
for (DynamicVector<size_t>::ConstIterator crows = row_idx.begin();
crows != row_idx.end(); crows++) {
size_t j = 0;
for (DynamicVector<size_t>::ConstIterator fcol = col_idx.begin();
fcol != col_idx.end(); fcol++) {
subm(i, j++) = orig((*crows), (*fcol));
}
}
}
};
// enum _a {
// USE_ALL_ROWS, // bla(:,set);
// USE_ALL_COLS // bla(set,:)
// };
//
// /* subm = orig(idx,:) oppure subm = orig(:,idx)*/
// static inline void semicolon(const DMat& orig, const std::vector<size_t>& idx, _a d, DMat& subm) {
// if (d == USE_ALL_COLS) { /* subm = orig(idx,:) */
// //Ridimensiono la subm
// subm.resize(idx.size(), orig.columns(), false);
// //popolo subm prendendo i valori alle idx-righe di orig
// for (std::vector<size_t>::const_iterator i = idx.begin(); i != idx.end(); ++i) {
//
// blaze::DenseRow<DMat> r_sub = blaze::row(subm, (*i));
// blaze::DenseRow<const DMat> r_orig = blaze::row(orig, (*i));
// r_sub = r_orig; //Ce stanno li SmartEspressioTempleits e usamoli no?
// }
// } else {
// subm.resize(orig.rows(), idx.size(), false);
// for (std::vector<size_t>::const_iterator j = idx.begin(); j != idx.end(); ++j) {
// blaze::DenseColumn<DMat> c_sub = blaze::column(subm, (*j));
// blaze::DenseColumn<const DMat> c_orig = blaze::column(orig, (*j));
// c_sub = c_orig; //Ammazzafigata li smartespressiontempleits!
// }
// }
// }
/* Riduce il vettore v a dimensione idx.size() in modo tale che gli
* elementi rimanenti abbiano i valori che precedentemente stavano nelle
* posizioni corrispondenti agli elementi di idx. In Matlab orig = orig(idx)
*/
static inline void subVecAssign(DynamicVector<double>& v, const std::vector<size_t>& idx) {
BLAZE_USER_ASSERT((v.size() >= idx.size()), "In subVecAssign v.size() è MINORE di idx.size()\n");
if (v.size() == idx.size())
return;
for (size_t i = 0; i < idx.size(); ++i)
v[i] = v[idx[i]];
v.resize(idx.size(), true);
}
/* subv = orig(set);*/
static inline void subVecExtract(DynamicVector<double>& subv, const DynamicVector<double>& orig, DynamicVector<size_t>& set) {
BLAZE_USER_ASSERT((orig.size() >= set.size()), "In subVectExtract orig.size() è MINORE di set.size()\n");
if (orig.size() == set.size())
return;
subv.resize(set.size(), false);
size_t i = 0;
for (DynamicVector<size_t>::Iterator j = set.begin(); j != set.end(); ++j, ++i) {
subv[i] = orig[(*j)];
}
}
/* Norma2 a.k.a. Euclidean Norm a.k.a L2 distance a.k.a L2 norm:
* sqrt( x[0]^2 + x[1]^2 + ... + x[n]^2 )*/
static inline double norma2(DynamicVector<double>& v) {
double ret = 0.0;
for (size_t i = 0; i < v.size(); i++) {
ret += (v[i] * v[i]);
}
return sqrt(ret);
}
/* Calcola la media degli elementi del vettore */
static inline double mean(DynamicVector<double>& v) {
double ret = 0.0;
for (size_t i = 0; i < v.size(); i++)
ret += v[i];
return ret / (double) (v.size());
}
// static inline void subVecAssign(const DynamicVector<double>& orig, const std::vector<size_t>& idx, DynamicVector<double>& subm) {
//
// subm.resize(idx.size(), false);
// size_t i = 0;
// //popolo subm prendendo i valori alle idx-righe di orig
// for (std::vector<size_t>::const_iterator it = idx.begin(); it != idx.end(); ++it, ++i)
// subm[i] = orig[(*it)];
//
// }
//
// static inline void semicolon(const DMat& orig, const DynamicVector<size_t>& idx, _a d, DMat& subm) {
// if (d == USE_ALL_COLS) { /* subm = orig(idx,:) */
// //Ridimensiono la subm
// subm.resize(idx.size(), orig.columns(), false);
// //popolo subm prendendo i valori alle idx-righe di orig
// for (DynamicVector<size_t>::ConstIterator i = idx.begin(); i != idx.end(); ++i) {
//
// blaze::DenseRow<DMat> r_sub = blaze::row(subm, (*i));
// blaze::DenseRow<const DMat> r_orig = blaze::row(orig, (*i));
// r_sub = r_orig; //Ce stanno li SmartEspressioTempleits e usamoli no?
// }
// } else {
// subm.resize(orig.rows(), idx.size(), false);
// for (DynamicVector<size_t>::ConstIterator j = idx.begin(); j != idx.end(); ++j) {
// blaze::DenseColumn<DMat> c_sub = blaze::column(subm, (*j));
// blaze::DenseColumn<const DMat> c_orig = blaze::column(orig, (*j));
// c_sub = c_orig; //Ammazzafigata li smartespressiontempleits!
// }
// }
// }
};
#endif /* MTXOPS_H */