matpackIV.cc

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/* Copyright (C) 2002-2012 Stefan Buehler <sbuehler@ltu.se>
 
   This program is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by the
   Free Software Foundation; either version 2, or (at your option) any
   later version.
 
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
 
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
   USA. */
 
#include "matpackIV.h"
#include "exceptions.h"
 
using std::runtime_error;
 
Tensor3View* Iterator4D::operator->() { return &msv; }
 
Tensor3View& Iterator4D::operator*() { return msv; }
 
const ConstTensor3View* ConstIterator4D::operator->() const { return &msv; }
 
const ConstTensor3View& ConstIterator4D::operator*() const { return msv; }
 
// Functions for ConstTensor4View:
// ------------------------------
 
 
bool ConstTensor4View::empty() const {
  return (nbooks() == 0 || npages() == 0 || nrows() == 0 || ncols() == 0);
}
 
Index ConstTensor4View::nbooks() const { return mbr.mextent; }
 
Index ConstTensor4View::npages() const { return mpr.mextent; }
 
Index ConstTensor4View::nrows() const { return mrr.mextent; }
 
Index ConstTensor4View::ncols() const { return mcr.mextent; }
 
ConstTensor4View ConstTensor4View::operator()(const Range& b,
                                              const Range& p,
                                              const Range& r,
                                              const Range& c) const {
  return ConstTensor4View(mdata, mbr, mpr, mrr, mcr, b, p, r, c);
}
 
ConstTensor3View ConstTensor4View::operator()(const Range& b,
                                              const Range& p,
                                              const Range& r,
                                              Index c) const {
  // Check that c is valid:
  assert(0 <= c);
  assert(c < mcr.mextent);
 
  return ConstTensor3View(
      mdata + mcr.mstart + c * mcr.mstride, mbr, mpr, mrr, b, p, r);
}
 
ConstTensor3View ConstTensor4View::operator()(const Range& b,
                                              const Range& p,
                                              Index r,
                                              const Range& c) const {
  // Check that r is valid:
  assert(0 <= r);
  assert(r < mrr.mextent);
 
  return ConstTensor3View(
      mdata + mrr.mstart + r * mrr.mstride, mbr, mpr, mcr, b, p, c);
}
 
ConstTensor3View ConstTensor4View::operator()(const Range& b,
                                              Index p,
                                              const Range& r,
                                              const Range& c) const {
  // Check that p is valid:
  assert(0 <= p);
  assert(p < mpr.mextent);
 
  return ConstTensor3View(
      mdata + mpr.mstart + p * mpr.mstride, mbr, mrr, mcr, b, r, c);
}
 
ConstTensor3View ConstTensor4View::operator()(Index b,
                                              const Range& p,
                                              const Range& r,
                                              const Range& c) const {
  // Check that b is valid:
  assert(0 <= b);
  assert(b < mbr.mextent);
 
  return ConstTensor3View(
      mdata + mbr.mstart + b * mbr.mstride, mpr, mrr, mcr, p, r, c);
}
 
ConstMatrixView ConstTensor4View::operator()(const Range& b,
                                             const Range& p,
                                             Index r,
                                             Index c) const {
  // Check that r and c are valid:
  assert(0 <= r);
  assert(0 <= c);
  assert(r < mrr.mextent);
  assert(c < mcr.mextent);
 
  return ConstMatrixView(
      mdata + mrr.mstart + r * mrr.mstride + mcr.mstart + c * mcr.mstride,
      mbr,
      mpr,
      b,
      p);
}
 
ConstMatrixView ConstTensor4View::operator()(const Range& b,
                                             Index p,
                                             const Range& r,
                                             Index c) const {
  // Check that p and c are valid:
  assert(0 <= p);
  assert(0 <= c);
  assert(p < mpr.mextent);
  assert(c < mcr.mextent);
 
  return ConstMatrixView(
      mdata + mpr.mstart + p * mpr.mstride + mcr.mstart + c * mcr.mstride,
      mbr,
      mrr,
      b,
      r);
}
 
ConstMatrixView ConstTensor4View::operator()(const Range& b,
                                             Index p,
                                             Index r,
                                             const Range& c) const {
  // Check that p and r are valid:
  assert(0 <= p);
  assert(0 <= r);
  assert(p < mpr.mextent);
  assert(r < mrr.mextent);
 
  return ConstMatrixView(
      mdata + mpr.mstart + p * mpr.mstride + mrr.mstart + r * mrr.mstride,
      mbr,
      mcr,
      b,
      c);
}
 
ConstMatrixView ConstTensor4View::operator()(Index b,
                                             const Range& p,
                                             Index r,
                                             const Range& c) const {
  // Check that b and r are valid:
  assert(0 <= b);
  assert(0 <= r);
  assert(b < mbr.mextent);
  assert(r < mrr.mextent);
 
  return ConstMatrixView(
      mdata + mbr.mstart + b * mbr.mstride + mrr.mstart + r * mrr.mstride,
      mpr,
      mcr,
      p,
      c);
}
 
ConstMatrixView ConstTensor4View::operator()(Index b,
                                             const Range& p,
                                             const Range& r,
                                             Index c) const {
  // Check that b and c are valid:
  assert(0 <= b);
  assert(0 <= c);
  assert(b < mbr.mextent);
  assert(c < mcr.mextent);
 
  return ConstMatrixView(
      mdata + mbr.mstart + b * mbr.mstride + mcr.mstart + c * mcr.mstride,
      mpr,
      mrr,
      p,
      r);
}
 
ConstMatrixView ConstTensor4View::operator()(Index b,
                                             Index p,
                                             const Range& r,
                                             const Range& c) const {
  // Check that b and p are valid:
  assert(0 <= b);
  assert(0 <= p);
  assert(b < mbr.mextent);
  assert(p < mpr.mextent);
 
  return ConstMatrixView(
      mdata + mbr.mstart + b * mbr.mstride + mpr.mstart + p * mpr.mstride,
      mrr,
      mcr,
      r,
      c);
}
 
ConstVectorView ConstTensor4View::operator()(const Range& b,
                                             Index p,
                                             Index r,
                                             Index c) const {
  // Check that p, r and c are valid:
  assert(0 <= p);
  assert(0 <= r);
  assert(0 <= c);
  assert(p < mpr.mextent);
  assert(r < mrr.mextent);
  assert(c < mcr.mextent);
 
  return ConstVectorView(mdata + mpr.mstart + p * mpr.mstride + mrr.mstart +
                             r * mrr.mstride + mcr.mstart + c * mcr.mstride,
                         mbr,
                         b);
}
 
ConstVectorView ConstTensor4View::operator()(Index b,
                                             const Range& p,
                                             Index r,
                                             Index c) const {
  // Check that b, r and c are valid:
  assert(0 <= b);
  assert(0 <= r);
  assert(0 <= c);
  assert(b < mbr.mextent);
  assert(r < mrr.mextent);
  assert(c < mcr.mextent);
 
  return ConstVectorView(mdata + mbr.mstart + b * mbr.mstride + mrr.mstart +
                             r * mrr.mstride + mcr.mstart + c * mcr.mstride,
                         mpr,
                         p);
}
 
ConstVectorView ConstTensor4View::operator()(Index b,
                                             Index p,
                                             const Range& r,
                                             Index c) const {
  // Check that b, p and c are valid:
  assert(0 <= b);
  assert(0 <= p);
  assert(0 <= c);
  assert(b < mbr.mextent);
  assert(p < mpr.mextent);
  assert(c < mcr.mextent);
 
  return ConstVectorView(mdata + mbr.mstart + b * mbr.mstride + mpr.mstart +
                             p * mpr.mstride + mcr.mstart + c * mcr.mstride,
                         mrr,
                         r);
}
 
ConstVectorView ConstTensor4View::operator()(Index b,
                                             Index p,
                                             Index r,
                                             const Range& c) const {
  // Check that b, p and r are valid:
  assert(0 <= b);
  assert(0 <= p);
  assert(0 <= r);
  assert(b < mbr.mextent);
  assert(p < mpr.mextent);
  assert(r < mrr.mextent);
 
  return ConstVectorView(mdata + mbr.mstart + b * mbr.mstride + mpr.mstart +
                             p * mpr.mstride + mrr.mstart + r * mrr.mstride,
                         mcr,
                         c);
}
 
Numeric* Tensor4View::get_c_array() {
  if (mbr.mstart != 0 ||
      mbr.mstride != mpr.mextent * mrr.mextent * mcr.mextent ||
      mpr.mstart != 0 || mpr.mstride != mrr.mextent * mcr.mextent ||
      mrr.mstart != 0 || mrr.mstride != mcr.mextent || mcr.mstart != 0 ||
      mcr.mstride != 1)
    throw std::runtime_error(
        "A Tensor4View can only be converted to a plain C-array if it's pointing to a continuous block of data");
 
  return mdata;
}
 
const Numeric* Tensor4View::get_c_array() const {
  if (mbr.mstart != 0 ||
      mbr.mstride != mpr.mextent * mrr.mextent * mcr.mextent ||
      mpr.mstart != 0 || mpr.mstride != mrr.mextent * mcr.mextent ||
      mrr.mstart != 0 || mrr.mstride != mcr.mextent || mcr.mstart != 0 ||
      mcr.mstride != 1)
    throw std::runtime_error(
        "A Tensor4View can only be converted to a plain C-array if it's pointing to a continuous block of data");
 
  return mdata;
}
 
ConstIterator4D ConstTensor4View::begin() const {
  return ConstIterator4D(ConstTensor3View(mdata + mbr.mstart, mpr, mrr, mcr),
                         mbr.mstride);
}
 
ConstIterator4D ConstTensor4View::end() const {
  return ConstIterator4D(
      ConstTensor3View(
          mdata + mbr.mstart + (mbr.mextent) * mbr.mstride, mpr, mrr, mcr),
      mbr.mstride);
}
 
ConstTensor4View::ConstTensor4View(const ConstTensor3View& a)
    : mbr(0, 1, a.mpr.mextent * a.mrr.mextent * a.mcr.mextent),
      mpr(a.mpr),
      mrr(a.mrr),
      mcr(a.mcr),
      mdata(a.mdata) {
  // Nothing to do here.
}
 
ConstTensor4View::ConstTensor4View(Numeric* data,
                                   const Range& br,
                                   const Range& pr,
                                   const Range& rr,
                                   const Range& cr)
    : mbr(br), mpr(pr), mrr(rr), mcr(cr), mdata(data) {
  // Nothing to do here.
}
 
ConstTensor4View::ConstTensor4View(Numeric* data,
                                   const Range& pb,
                                   const Range& pp,
                                   const Range& pr,
                                   const Range& pc,
                                   const Range& nb,
                                   const Range& np,
                                   const Range& nr,
                                   const Range& nc)
    : mbr(pb, nb), mpr(pp, np), mrr(pr, nr), mcr(pc, nc), mdata(data) {
  // Nothing to do here.
}
 
std::ostream& operator<<(std::ostream& os, const ConstTensor4View& v) {
  // Page iterators:
  ConstIterator4D ib = v.begin();
  const ConstIterator4D end_book = v.end();
 
  if (ib != end_book) {
    os << *ib;
    ++ib;
  }
 
  for (; ib != end_book; ++ib) {
    os << "\n\n";
    os << *ib;
  }
 
  return os;
}
 
// Functions for Tensor4View:
// -------------------------
 
Tensor4View Tensor4View::operator()(const Range& b,
                                    const Range& p,
                                    const Range& r,
                                    const Range& c) {
  return Tensor4View(mdata, mbr, mpr, mrr, mcr, b, p, r, c);
}
 
Tensor3View Tensor4View::operator()(const Range& b,
                                    const Range& p,
                                    const Range& r,
                                    Index c) {
  // Check that c is valid:
  assert(0 <= c);
  assert(c < mcr.mextent);
 
  return Tensor3View(
      mdata + mcr.mstart + c * mcr.mstride, mbr, mpr, mrr, b, p, r);
}
 
Tensor3View Tensor4View::operator()(const Range& b,
                                    const Range& p,
                                    Index r,
                                    const Range& c) {
  // Check that r is valid:
  assert(0 <= r);
  assert(r < mrr.mextent);
 
  return Tensor3View(
      mdata + mrr.mstart + r * mrr.mstride, mbr, mpr, mcr, b, p, c);
}
 
Tensor3View Tensor4View::operator()(const Range& b,
                                    Index p,
                                    const Range& r,
                                    const Range& c) {
  // Check that p is valid:
  assert(0 <= p);
  assert(p < mpr.mextent);
 
  return Tensor3View(
      mdata + mpr.mstart + p * mpr.mstride, mbr, mrr, mcr, b, r, c);
}
 
Tensor3View Tensor4View::operator()(Index b,
                                    const Range& p,
                                    const Range& r,
                                    const Range& c) {
  // Check that b is valid:
  assert(0 <= b);
  assert(b < mbr.mextent);
 
  return Tensor3View(
      mdata + mbr.mstart + b * mbr.mstride, mpr, mrr, mcr, p, r, c);
}
 
MatrixView Tensor4View::operator()(const Range& b,
                                   const Range& p,
                                   Index r,
                                   Index c) {
  // Check that r and c are valid:
  assert(0 <= r);
  assert(0 <= c);
  assert(r < mrr.mextent);
  assert(c < mcr.mextent);
 
  return MatrixView(
      mdata + mrr.mstart + r * mrr.mstride + mcr.mstart + c * mcr.mstride,
      mbr,
      mpr,
      b,
      p);
}
 
MatrixView Tensor4View::operator()(const Range& b,
                                   Index p,
                                   const Range& r,
                                   Index c) {
  // Check that p and c are valid:
  assert(0 <= p);
  assert(0 <= c);
  assert(p < mpr.mextent);
  assert(c < mcr.mextent);
 
  return MatrixView(
      mdata + mpr.mstart + p * mpr.mstride + mcr.mstart + c * mcr.mstride,
      mbr,
      mrr,
      b,
      r);
}
 
MatrixView Tensor4View::operator()(const Range& b,
                                   Index p,
                                   Index r,
                                   const Range& c) {
  // Check that p and r are valid:
  assert(0 <= p);
  assert(0 <= r);
  assert(p < mpr.mextent);
  assert(r < mrr.mextent);
 
  return MatrixView(
      mdata + mpr.mstart + p * mpr.mstride + mrr.mstart + r * mrr.mstride,
      mbr,
      mcr,
      b,
      c);
}
 
MatrixView Tensor4View::operator()(Index b,
                                   const Range& p,
                                   Index r,
                                   const Range& c) {
  // Check that b and r are valid:
  assert(0 <= b);
  assert(0 <= r);
  assert(b < mbr.mextent);
  assert(r < mrr.mextent);
 
  return MatrixView(
      mdata + mbr.mstart + b * mbr.mstride + mrr.mstart + r * mrr.mstride,
      mpr,
      mcr,
      p,
      c);
}
 
MatrixView Tensor4View::operator()(Index b,
                                   const Range& p,
                                   const Range& r,
                                   Index c) {
  // Check that b and c are valid:
  assert(0 <= b);
  assert(0 <= c);
  assert(b < mbr.mextent);
  assert(c < mcr.mextent);
 
  return MatrixView(
      mdata + mbr.mstart + b * mbr.mstride + mcr.mstart + c * mcr.mstride,
      mpr,
      mrr,
      p,
      r);
}
 
MatrixView Tensor4View::operator()(Index b,
                                   Index p,
                                   const Range& r,
                                   const Range& c) {
  // Check that b and p are valid:
  assert(0 <= b);
  assert(0 <= p);
  assert(b < mbr.mextent);
  assert(p < mpr.mextent);
 
  return MatrixView(
      mdata + mbr.mstart + b * mbr.mstride + mpr.mstart + p * mpr.mstride,
      mrr,
      mcr,
      r,
      c);
}
 
VectorView Tensor4View::operator()(const Range& b, Index p, Index r, Index c) {
  // Check that p, r and c are valid:
  assert(0 <= p);
  assert(0 <= r);
  assert(0 <= c);
  assert(p < mpr.mextent);
  assert(r < mrr.mextent);
  assert(c < mcr.mextent);
 
  return VectorView(mdata + mpr.mstart + p * mpr.mstride + mrr.mstart +
                        r * mrr.mstride + mcr.mstart + c * mcr.mstride,
                    mbr,
                    b);
}
 
VectorView Tensor4View::operator()(Index b, const Range& p, Index r, Index c) {
  // Check that b, r and c are valid:
  assert(0 <= b);
  assert(0 <= r);
  assert(0 <= c);
  assert(b < mbr.mextent);
  assert(r < mrr.mextent);
  assert(c < mcr.mextent);
 
  return VectorView(mdata + mbr.mstart + b * mbr.mstride + mrr.mstart +
                        r * mrr.mstride + mcr.mstart + c * mcr.mstride,
                    mpr,
                    p);
}
 
VectorView Tensor4View::operator()(Index b, Index p, const Range& r, Index c) {
  // Check that b, p and c are valid:
  assert(0 <= b);
  assert(0 <= p);
  assert(0 <= c);
  assert(b < mbr.mextent);
  assert(p < mpr.mextent);
  assert(c < mcr.mextent);
 
  return VectorView(mdata + mbr.mstart + b * mbr.mstride + mpr.mstart +
                        p * mpr.mstride + mcr.mstart + c * mcr.mstride,
                    mrr,
                    r);
}
 
VectorView Tensor4View::operator()(Index b, Index p, Index r, const Range& c) {
  // Check that b, p and r are valid:
  assert(0 <= b);
  assert(0 <= p);
  assert(0 <= r);
  assert(b < mbr.mextent);
  assert(p < mpr.mextent);
  assert(r < mrr.mextent);
 
  return VectorView(mdata + mbr.mstart + b * mbr.mstride + mpr.mstart +
                        p * mpr.mstride + mrr.mstart + r * mrr.mstride,
                    mcr,
                    c);
}
 
Iterator4D Tensor4View::begin() {
  return Iterator4D(Tensor3View(mdata + mbr.mstart, mpr, mrr, mcr),
                    mbr.mstride);
}
 
Iterator4D Tensor4View::end() {
  return Iterator4D(
      Tensor3View(
          mdata + mbr.mstart + (mbr.mextent) * mbr.mstride, mpr, mrr, mcr),
      mbr.mstride);
}
 
Tensor4View& Tensor4View::operator=(const ConstTensor4View& m) {
  // Check that sizes are compatible:
  assert(mbr.mextent == m.mbr.mextent);
  assert(mpr.mextent == m.mpr.mextent);
  assert(mrr.mextent == m.mrr.mextent);
  assert(mcr.mextent == m.mcr.mextent);
 
  copy(m.begin(), m.end(), begin());
  return *this;
}
 
Tensor4View& Tensor4View::operator=(const Tensor4View& m) {
  // Check that sizes are compatible:
  assert(mbr.mextent == m.mbr.mextent);
  assert(mpr.mextent == m.mpr.mextent);
  assert(mrr.mextent == m.mrr.mextent);
  assert(mcr.mextent == m.mcr.mextent);
 
  copy(m.begin(), m.end(), begin());
  return *this;
}
 
Tensor4View& Tensor4View::operator=(const Tensor4& m) {
  // Check that sizes are compatible:
  assert(mbr.mextent == m.mbr.mextent);
  assert(mpr.mextent == m.mpr.mextent);
  assert(mrr.mextent == m.mrr.mextent);
  assert(mcr.mextent == m.mcr.mextent);
 
  copy(m.begin(), m.end(), begin());
  return *this;
}
 
Tensor4View& Tensor4View::operator=(Numeric x) {
  copy(x, begin(), end());
  return *this;
}
 
// Some little helper functions:
//------------------------------
 
Tensor4View& Tensor4View::operator*=(Numeric x) {
  const Iterator4D eb = end();
  for (Iterator4D b = begin(); b != eb; ++b) {
    *b *= x;
  }
  return *this;
}
 
Tensor4View& Tensor4View::operator/=(Numeric x) {
  const Iterator4D eb = end();
  for (Iterator4D b = begin(); b != eb; ++b) {
    *b /= x;
  }
  return *this;
}
 
Tensor4View& Tensor4View::operator+=(Numeric x) {
  const Iterator4D eb = end();
  for (Iterator4D b = begin(); b != eb; ++b) {
    *b += x;
  }
  return *this;
}
 
Tensor4View& Tensor4View::operator-=(Numeric x) {
  const Iterator4D eb = end();
  for (Iterator4D b = begin(); b != eb; ++b) {
    *b -= x;
  }
  return *this;
}
 
Tensor4View& Tensor4View::operator*=(const ConstTensor4View& x) {
  assert(nbooks() == x.nbooks());
  assert(npages() == x.npages());
  assert(nrows() == x.nrows());
  assert(ncols() == x.ncols());
  ConstIterator4D xb = x.begin();
  Iterator4D b = begin();
  const Iterator4D eb = end();
  for (; b != eb; ++b, ++xb) {
    *b *= *xb;
  }
  return *this;
}
 
Tensor4View& Tensor4View::operator/=(const ConstTensor4View& x) {
  assert(nbooks() == x.nbooks());
  assert(npages() == x.npages());
  assert(nrows() == x.nrows());
  assert(ncols() == x.ncols());
  ConstIterator4D xb = x.begin();
  Iterator4D b = begin();
  const Iterator4D eb = end();
  for (; b != eb; ++b, ++xb) {
    *b /= *xb;
  }
  return *this;
}
 
Tensor4View& Tensor4View::operator+=(const ConstTensor4View& x) {
  assert(nbooks() == x.nbooks());
  assert(npages() == x.npages());
  assert(nrows() == x.nrows());
  assert(ncols() == x.ncols());
  ConstIterator4D xb = x.begin();
  Iterator4D b = begin();
  const Iterator4D eb = end();
  for (; b != eb; ++b, ++xb) {
    *b += *xb;
  }
  return *this;
}
 
Tensor4View& Tensor4View::operator-=(const ConstTensor4View& x) {
  assert(nbooks() == x.nbooks());
  assert(npages() == x.npages());
  assert(nrows() == x.nrows());
  assert(ncols() == x.ncols());
  ConstIterator4D xb = x.begin();
  Iterator4D b = begin();
  const Iterator4D eb = end();
  for (; b != eb; ++b, ++xb) {
    *b -= *xb;
  }
  return *this;
}
 
Tensor4View::Tensor4View(const Tensor3View& a)
    : ConstTensor4View(
          a.mdata,
          Range(0, 1, a.mpr.mextent * a.mrr.mextent * a.mcr.mextent),
          a.mpr,
          a.mrr,
          a.mcr) {
  // Nothing to do here.
}
 
Tensor4View::Tensor4View(Numeric* data,
                         const Range& br,
                         const Range& pr,
                         const Range& rr,
                         const Range& cr)
    : ConstTensor4View(data, br, pr, rr, cr) {
  // Nothing to do here.
}
 
Tensor4View::Tensor4View(Numeric* data,
                         const Range& pb,
                         const Range& pp,
                         const Range& pr,
                         const Range& pc,
                         const Range& nb,
                         const Range& np,
                         const Range& nr,
                         const Range& nc)
    : ConstTensor4View(data, pb, pp, pr, pc, nb, np, nr, nc) {
  // Nothing to do here.
}
 
void copy(ConstIterator4D origin,
          const ConstIterator4D& end,
          Iterator4D target) {
  for (; origin != end; ++origin, ++target) {
    // We use the copy function for the next smaller rank of tensor
    // recursively:
    copy(origin->begin(), origin->end(), target->begin());
  }
}
 
void copy(Numeric x, Iterator4D target, const Iterator4D& end) {
  for (; target != end; ++target) {
    // We use the copy function for the next smaller rank of tensor
    // recursively:
    copy(x, target->begin(), target->end());
  }
}
 
// Functions for Tensor4:
// ---------------------
 
Tensor4::Tensor4(Index b, Index p, Index r, Index c)
    : Tensor4View(new Numeric[b * p * r * c],
                  Range(0, b, p * r * c),
                  Range(0, p, r * c),
                  Range(0, r, c),
                  Range(0, c)) {
  // Nothing to do here.
}
 
Tensor4::Tensor4(Index b, Index p, Index r, Index c, Numeric fill)
    : Tensor4View(new Numeric[b * p * r * c],
                  Range(0, b, p * r * c),
                  Range(0, p, r * c),
                  Range(0, r, c),
                  Range(0, c)) {
  // Here we can access the raw memory directly, for slightly
  // increased efficiency:
  std::fill_n(mdata, b * p * r * c, fill);
}
 
Tensor4::Tensor4(const ConstTensor4View& m)
    : Tensor4View(new Numeric[m.nbooks() * m.npages() * m.nrows() * m.ncols()],
                  Range(0, m.nbooks(), m.npages() * m.nrows() * m.ncols()),
                  Range(0, m.npages(), m.nrows() * m.ncols()),
                  Range(0, m.nrows(), m.ncols()),
                  Range(0, m.ncols())) {
  copy(m.begin(), m.end(), begin());
}
 
Tensor4::Tensor4(const Tensor4& m)
    : Tensor4View(new Numeric[m.nbooks() * m.npages() * m.nrows() * m.ncols()],
                  Range(0, m.nbooks(), m.npages() * m.nrows() * m.ncols()),
                  Range(0, m.npages(), m.nrows() * m.ncols()),
                  Range(0, m.nrows(), m.ncols()),
                  Range(0, m.ncols())) {
  // There is a catch here: If m is an empty tensor, then it will have
  // dimensions of size 0. But these are used to initialize the stride
  // for higher dimensions! Thus, this method has to be consistent
  // with the behaviour of Range::Range. For now, Range::Range allows
  // also stride 0.
  std::memcpy(mdata,
              m.mdata,
              nbooks() * npages() * nrows() * ncols() * sizeof(Numeric));
}
 
 
Tensor4& Tensor4::operator=(const Tensor4& x) {
  if (this != &x) {
    resize(x.nbooks(), x.npages(), x.nrows(), x.ncols());
    std::memcpy(mdata,
                x.mdata,
                nbooks() * npages() * nrows() * ncols() * sizeof(Numeric));
  }
  return *this;
}
 
Tensor4& Tensor4::operator=(Tensor4&& x) noexcept {
  if (this != &x) {
    delete[] mdata;
    mdata = x.mdata;
    mbr = x.mbr;
    mpr = x.mpr;
    mrr = x.mrr;
    mcr = x.mcr;
    x.mbr = Range(0, 0);
    x.mpr = Range(0, 0);
    x.mrr = Range(0, 0);
    x.mcr = Range(0, 0);
    x.mdata = nullptr;
  }
  return *this;
}
 
Tensor4& Tensor4::operator=(Numeric x) {
  std::fill_n(mdata, nbooks() * npages() * nrows() * ncols(), x);
  return *this;
}
 
void Tensor4::resize(Index b, Index p, Index r, Index c) {
  assert(0 <= b);
  assert(0 <= p);
  assert(0 <= r);
  assert(0 <= c);
 
  if (mbr.mextent != b || mpr.mextent != p || mrr.mextent != r ||
      mcr.mextent != c) {
    delete[] mdata;
    mdata = new Numeric[b * p * r * c];
 
    mbr.mstart = 0;
    mbr.mextent = b;
    mbr.mstride = p * r * c;
 
    mpr.mstart = 0;
    mpr.mextent = p;
    mpr.mstride = r * c;
 
    mrr.mstart = 0;
    mrr.mextent = r;
    mrr.mstride = c;
 
    mcr.mstart = 0;
    mcr.mextent = c;
    mcr.mstride = 1;
  }
}
 
void swap(Tensor4& t1, Tensor4& t2) {
  std::swap(t1.mbr, t2.mbr);
  std::swap(t1.mpr, t2.mpr);
  std::swap(t1.mrr, t2.mrr);
  std::swap(t1.mcr, t2.mcr);
  std::swap(t1.mdata, t2.mdata);
}
 
Tensor4::~Tensor4() {
  //   cout << "Destroying a Tensor4:\n"
  //        << *this << "\n........................................\n";
  delete[] mdata;
}
 
void transform(Tensor4View y, double (&my_func)(double), ConstTensor4View x) {
  // Check dimensions:
  assert(y.nbooks() == x.nbooks());
  assert(y.npages() == x.npages());
  assert(y.nrows() == x.nrows());
  assert(y.ncols() == x.ncols());
 
  const ConstIterator4D xe = x.end();
  ConstIterator4D xi = x.begin();
  Iterator4D yi = y.begin();
  for (; xi != xe; ++xi, ++yi) {
    // Use the transform function of lower dimensional tensors
    // recursively:
    transform(*yi, my_func, *xi);
  }
}
 
Numeric max(const ConstTensor4View& x) {
  const ConstIterator4D xe = x.end();
  ConstIterator4D xi = x.begin();
 
  // Initial value for max:
  Numeric themax = max(*xi);
  ++xi;
 
  for (; xi != xe; ++xi) {
    // Use the max function of lower dimensional tensors
    // recursively:
    Numeric maxi = max(*xi);
    if (maxi > themax) themax = maxi;
  }
 
  return themax;
}
 
Numeric min(const ConstTensor4View& x) {
  const ConstIterator4D xe = x.end();
  ConstIterator4D xi = x.begin();
 
  // Initial value for min:
  Numeric themin = min(*xi);
  ++xi;
 
  for (; xi != xe; ++xi) {
    // Use the min function of lower dimensional tensors
    // recursively:
    Numeric mini = min(*xi);
    if (mini < themin) themin = mini;
  }
 
  return themin;
}
 
// Helper function for debugging
#ifndef NDEBUG
 
Numeric debug_tensor4view_get_elem(
    Tensor4View& tv, Index b, Index p, Index r, Index c) {
  return tv(b, p, r, c);
}
 
#endif