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Commit cae2fb28 authored by Davis King's avatar Davis King
Browse files

Added the range() function and an overload of subm() that allows you to 

pick out slices of matrices like in Matlab.

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%402696
parent f9f34de5
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dlib/matrix/matrix_utilities.h
View file @ cae2fb28
...@@ -1803,6 +1803,153 @@ convergence: ...@@ -1803,6 +1803,153 @@ convergence:
// ---------------------------------------------------------------------------------------- // ----------------------------------------------------------------------------------------
// ---------------------------------------------------------------------------------------- // ----------------------------------------------------------------------------------------
// ----------------------------------------------------------------------------------------
class matrix_range_exp
{
public:
typedef long type;
typedef matrix_range_exp ref_type;
typedef memory_manager<char>::kernel_1a mem_manager_type;
const static long NR = 0;
const static long NC = 1;
matrix_range_exp (
long start_,
long end_
)
{
start = start_;
inc = 1;
nr_ = end_ - start_ + 1;
}
matrix_range_exp (
long start_,
long inc_,
long end_
)
{
start = start_;
inc = inc_;
nr_ = (end_ - start_)/inc_ + 1;
}
const long operator() (
long r,
long c
) const { return start + r*inc; }
template <typename U, long iNR, long iNC , typename MM>
bool aliases (
const matrix<U,iNR,iNC,MM>& item
) const { return false; }
template <typename U, long iNR, long iNC, typename MM >
bool destructively_aliases (
const matrix<U,iNR,iNC,MM>& item
) const { return false; }
long nr (
) const { return nr_; }
long nc (
) const { return NC; }
const ref_type& ref(
) const { return *this; }
long nr_;
long start;
long inc;
};
// ----------------------------------------------------------------------------------------
template <long start, long inc, long end>
class matrix_range_static_exp
{
public:
typedef long type;
typedef matrix_range_static_exp ref_type;
typedef memory_manager<char>::kernel_1a mem_manager_type;
const static long NR = (end - start)/inc + 1;
const static long NC = 1;
const long operator() (
long r,
long c
) const { return start + r*inc; }
template <typename U, long iNR, long iNC , typename MM>
bool aliases (
const matrix<U,iNR,iNC,MM>& item
) const { return false; }
template <typename U, long iNR, long iNC, typename MM >
bool destructively_aliases (
const matrix<U,iNR,iNC,MM>& item
) const { return false; }
long nr (
) const { return NR; }
long nc (
) const { return NC; }
const ref_type& ref(
) const { return *this; }
};
// ----------------------------------------------------------------------------------------
template <long start, long inc, long end>
const matrix_exp<matrix_range_static_exp<start,inc,end> > range (
)
{
COMPILE_TIME_ASSERT(start <= end);
return matrix_exp<matrix_range_static_exp<start,inc,end> >(matrix_range_static_exp<start,inc,end>());
}
template <long start, long end>
const matrix_exp<matrix_range_static_exp<start,1,end> > range (
)
{
COMPILE_TIME_ASSERT(start <= end);
return matrix_exp<matrix_range_static_exp<start,1,end> >(matrix_range_static_exp<start,1,end>());
}
inline const matrix_exp<matrix_range_exp> range (
long start,
long end
)
{
DLIB_ASSERT(start <= end,
"\tconst matrix_exp range(start, end)"
<< "\n\tstart can't be bigger than end"
<< "\n\tstart: " << start
<< "\n\tend: " << end
);
return matrix_exp<matrix_range_exp>(matrix_range_exp(start,end));
}
inline const matrix_exp<matrix_range_exp> range (
long start,
long inc,
long end
)
{
DLIB_ASSERT(start <= end,
"\tconst matrix_exp range(start, inc, end)"
<< "\n\tstart can't be bigger than end"
<< "\n\tstart: " << start
<< "\n\tend: " << end
);
return matrix_exp<matrix_range_exp>(matrix_range_exp(start,inc,end));
}
// ---------------------------------------------------------------------------------------- // ----------------------------------------------------------------------------------------
template < template <
...@@ -1949,6 +2096,105 @@ convergence: ...@@ -1949,6 +2096,105 @@ convergence:
return matrix_exp<exp>(exp(m,rect.top(),rect.left(),rect.height(),rect.width())); return matrix_exp<exp>(exp(m,rect.top(),rect.left(),rect.height(),rect.width()));
} }
// ----------------------------------------------------------------------------------------
template <
typename M,
typename EXPr,
typename EXPc
>
class matrix_sub_range_exp
{
/*!
REQUIREMENTS ON M, EXPr and EXPc
- must be a matrix_exp or matrix_ref object (or
an object with a compatible interface).
!*/
public:
typedef typename M::type type;
typedef matrix_sub_range_exp ref_type;
typedef typename M::mem_manager_type mem_manager_type;
const static long NR = EXPr::NR*EXPr::NC;
const static long NC = EXPc::NR*EXPr::NC;
matrix_sub_range_exp (
const M& m_,
const EXPr& rows_,
const EXPc& cols_
) :
m(m_),
rows(rows_),
cols(cols_)
{
}
const typename M::type operator() (
long r,
long c
) const { return m(rows(r),cols(c)); }
template <typename U, long iNR, long iNC, typename MM >
bool aliases (
const matrix<U,iNR,iNC,MM>& item
) const { return m.aliases(item) || rows.aliases(item) || cols.aliases(item); }
template <typename U, long iNR, long iNC , typename MM>
bool destructively_aliases (
const matrix<U,iNR,iNC,MM>& item
) const { return m.aliases(item) || rows.aliases(item) || cols.aliases(item); }
const ref_type& ref(
) const { return *this; }
long nr (
) const { return rows.size(); }
long nc (
) const { return cols.size(); }
private:
const M m;
EXPr rows;
EXPc cols;
};
template <
typename EXP,
typename EXPr,
typename EXPc
>
const matrix_exp<matrix_sub_range_exp<matrix_exp<EXP>,matrix_exp<EXPr>,matrix_exp<EXPc> > > subm (
const matrix_exp<EXP>& m,
const matrix_exp<EXPr>& rows,
const matrix_exp<EXPc>& cols
)
{
// the rows and cols matrices must contain elements of type long
COMPILE_TIME_ASSERT((is_same_type<typename EXPr::type,long>::value == true));
COMPILE_TIME_ASSERT((is_same_type<typename EXPc::type,long>::value == true));
DLIB_ASSERT(0 <= min(rows) && max(rows) < m.nr() && 0 <= min(cols) && max(cols) < m.nc() &&
(rows.nr() == 1 || rows.nc() == 1) && (cols.nr() == 1 || cols.nc() == 1),
"\tconst matrix_exp subm(const matrix_exp& m, const matrix_exp& rows, const matrix_exp& cols)"
<< "\n\tYou have given invalid arguments to this function"
<< "\n\tm.nr(): " << m.nr()
<< "\n\tm.nc(): " << m.nc()
<< "\n\tmin(rows): " << min(rows)
<< "\n\tmax(rows): " << max(rows)
<< "\n\tmin(cols): " << min(cols)
<< "\n\tmax(cols): " << max(cols)
<< "\n\trows.nr(): " << rows.nr()
<< "\n\trows.nc(): " << rows.nc()
<< "\n\tcols.nr(): " << cols.nr()
<< "\n\tcols.nc(): " << cols.nc()
);
typedef matrix_sub_range_exp<matrix_exp<EXP>,matrix_exp<EXPr>,matrix_exp<EXPc> > exp;
return matrix_exp<exp>(exp(m,rows,cols));
}
// ---------------------------------------------------------------------------------------- // ----------------------------------------------------------------------------------------
struct op_rowm struct op_rowm
......
dlib/matrix/matrix_utilities_abstract.h
View file @ cae2fb28
...@@ -213,6 +213,71 @@ namespace dlib ...@@ -213,6 +213,71 @@ namespace dlib
the matrix m) the matrix m)
!*/ !*/
// ----------------------------------------------------------------------------------------
template <long start, long inc, long end>
const matrix_exp range (
);
/*!
requires
- start <= end
ensures
- returns a matrix R such that:
- R::type == long
- R.nr() == (end - start)/inc + 1
- R.nc() == 1
- R(i) == start + i*inc
!*/
template <long start, long end>
const matrix_exp range (
) { return range<start,1,end>(); }
const matrix_exp range (
long start,
long inc,
long end
);
/*!
requires
- start <= end
ensures
- returns a matrix R such that:
- R::type == long
- R.nr() == (end - start)/inc + 1
- R.nc() == 1
- R(i) == start + i*inc
!*/
const matrix_exp range (
long start,
long end
) { return range(start,1,end); }
// ----------------------------------------------------------------------------------------
const matrix_exp subm (
const matrix_exp& m,
const matrix_exp& rows,
const matrix_exp& cols,
);
/*!
requires
- rows and cols contain elements of type long
- 0 <= min(rows) && max(rows) < m.nr()
- 0 <= min(cols) && max(cols) < m.nc()
- rows.nr() == 1 || rows.nc() == 1
- cols.nr() == 1 || cols.nc() == 1
(i.e. rows and cols must be vectors)
ensures
- returns a matrix R such that:
- R::type == the same type that was in m
- R.nr() == rows.size()
- R.nc() == cols.size()
- for all valid r and c:
R(r,c) == m(rows(r),cols(c))
!*/
// ---------------------------------------------------------------------------------------- // ----------------------------------------------------------------------------------------
const matrix_exp subm ( const matrix_exp subm (
......
dlib/test/matrix.cpp
View file @ cae2fb28
...@@ -1615,6 +1615,139 @@ namespace ...@@ -1615,6 +1615,139 @@ namespace
DLIB_CASSERT(diagm(i) == m,""); DLIB_CASSERT(diagm(i) == m,"");
} }
{
DLIB_CASSERT(range(0,5).nr() == 6,"");
DLIB_CASSERT(range(1,5).nr() == 5,"");
DLIB_CASSERT(range(0,5).nc() == 1,"");
DLIB_CASSERT(range(1,5).nc() == 1,"");
DLIB_CASSERT(trans(range(0,5)).nc() == 6,"");
DLIB_CASSERT(trans(range(1,5)).nc() == 5,"");
DLIB_CASSERT(trans(range(0,5)).nr() == 1,"");
DLIB_CASSERT(trans(range(1,5)).nr() == 1,"");
DLIB_CASSERT(range(0,2,5).nr() == 3,"");
DLIB_CASSERT(range(1,2,5).nr() == 3,"");
DLIB_CASSERT(range(0,2,5).nc() == 1,"");
DLIB_CASSERT(range(1,2,5).nc() == 1,"");
DLIB_CASSERT(trans(range(0,2,5)).nc() == 3,"");
DLIB_CASSERT(trans(range(1,2,5)).nc() == 3,"");
DLIB_CASSERT(trans(range(0,2,5)).nr() == 1,"");
DLIB_CASSERT(trans(range(1,2,5)).nr() == 1,"");
DLIB_CASSERT(range(0,3,6).nr() == 3,"");
DLIB_CASSERT(range(1,3,5).nr() == 2,"");
DLIB_CASSERT(range(0,3,5).nc() == 1,"");
DLIB_CASSERT(range(1,3,5).nc() == 1,"");
DLIB_CASSERT(trans(range(0,3,6)).nc() == 3,"");
DLIB_CASSERT(trans(range(1,3,5)).nc() == 2,"");
DLIB_CASSERT(trans(range(0,3,5)).nr() == 1,"");
DLIB_CASSERT(trans(range(1,3,5)).nr() == 1,"");
DLIB_CASSERT(range(1,9,5).nr() == 1,"");
DLIB_CASSERT(range(1,9,5).nc() == 1,"");
DLIB_CASSERT(range(0,0).nr() == 1,"");
DLIB_CASSERT(range(0,0).nc() == 1,"");
DLIB_CASSERT(range(1,1)(0) == 1,"");
DLIB_CASSERT(range(0,5)(0) == 0 && range(0,5)(1) == 1 && range(0,5)(5) == 5,"");
DLIB_CASSERT(range(1,2,5)(0) == 1 && range(1,2,5)(1) == 3 && range(1,2,5)(2) == 5,"");
DLIB_CASSERT((range<0,5>()(0) == 0 && range<0,5>()(1) == 1 && range<0,5>()(5) == 5),"");
DLIB_CASSERT((range<1,2,5>()(0) == 1 && range<1,2,5>()(1) == 3 && range<1,2,5>()(2) == 5),"");
DLIB_CASSERT((range<0,5>().nr() == 6),"");
DLIB_CASSERT((range<1,5>().nr() == 5),"");
DLIB_CASSERT((range<0,5>().nc() == 1),"");
DLIB_CASSERT((range<1,5>().nc() == 1),"");
DLIB_CASSERT((trans(range<0,5>()).nc() == 6),"");
DLIB_CASSERT((trans(range<1,5>()).nc() == 5),"");
DLIB_CASSERT((trans(range<0,5>()).nr() == 1),"");
DLIB_CASSERT((trans(range<1,5>()).nr() == 1),"");
DLIB_CASSERT((range<0,2,5>().nr() == 3),"");
DLIB_CASSERT((range<1,2,5>().nr() == 3),"");
DLIB_CASSERT((range<0,2,5>().nc() == 1),"");
DLIB_CASSERT((range<1,2,5>().nc() == 1),"");
DLIB_CASSERT((trans(range<0,2,5>()).nc() == 3),"");
DLIB_CASSERT((trans(range<1,2,5>()).nc() == 3),"");
DLIB_CASSERT((trans(range<0,2,5>()).nr() == 1),"");
DLIB_CASSERT((trans(range<1,2,5>()).nr() == 1),"");
DLIB_CASSERT((range<0,3,6>().nr() == 3),"");
DLIB_CASSERT((range<1,3,5>().nr() == 2),"");
DLIB_CASSERT((range<0,3,5>().nc() == 1),"");
DLIB_CASSERT((range<1,3,5>().nc() == 1),"");
DLIB_CASSERT((trans(range<0,3,6>()).nc() == 3),"");
DLIB_CASSERT((trans(range<1,3,5>()).nc() == 2),"");
DLIB_CASSERT((trans(range<0,3,5>()).nr() == 1),"");
DLIB_CASSERT((trans(range<1,3,5>()).nr() == 1),"");
}
{
matrix<double> m(4,3);
for (long r = 0; r < m.nr(); ++r)
{
for (long c = 0; c < m.nc(); ++c)
{
m(r,c) = r*c;
}
}
DLIB_CASSERT(subm(m,range(0,3),range(0,0)) == colm(m,0),"");
DLIB_CASSERT(subm(m,range(0,3),range(1,1)) == colm(m,1),"");
DLIB_CASSERT(subm(m,range(0,3),range(2,2)) == colm(m,2),"");
DLIB_CASSERT(subm(m,range(0,0),range(0,2)) == rowm(m,0),"");
DLIB_CASSERT(subm(m,range(1,1),range(0,2)) == rowm(m,1),"");
DLIB_CASSERT(subm(m,range(2,2),range(0,2)) == rowm(m,2),"");
DLIB_CASSERT(subm(m,range(3,3),range(0,2)) == rowm(m,3),"");
DLIB_CASSERT(subm(m,0,0,2,2) == subm(m,range(0,1),range(0,1)),"");
DLIB_CASSERT(subm(m,1,1,2,2) == subm(m,range(1,2),range(1,2)),"");
matrix<double,2,2> m2 = subm(m,range(0,2,2),range(0,2,2));
DLIB_CASSERT(m2(0,0) == m(0,0),"");
DLIB_CASSERT(m2(0,1) == m(0,2),"");
DLIB_CASSERT(m2(1,0) == m(2,0),"");
DLIB_CASSERT(m2(1,1) == m(2,2),"");
}
{
matrix<double,4,3> m(4,3);
for (long r = 0; r < m.nr(); ++r)
{
for (long c = 0; c < m.nc(); ++c)
{
m(r,c) = r*c;
}
}
DLIB_CASSERT(subm(m,range<0,3>(),range<0,0>()) == colm(m,0),"");
DLIB_CASSERT(subm(m,range<0,3>(),range<1,1>()) == colm(m,1),"");
DLIB_CASSERT(subm(m,range<0,3>(),range<2,2>()) == colm(m,2),"");
DLIB_CASSERT(subm(m,range<0,0>(),range<0,2>()) == rowm(m,0),"");
DLIB_CASSERT(subm(m,range<1,1>(),range<0,2>()) == rowm(m,1),"");
DLIB_CASSERT(subm(m,range<2,2>(),range<0,2>()) == rowm(m,2),"");
DLIB_CASSERT(subm(m,range<3,3>(),range<0,2>()) == rowm(m,3),"");
DLIB_CASSERT(subm(m,0,0,2,2) == subm(m,range<0,1>(),range<0,1>()),"");
DLIB_CASSERT(subm(m,1,1,2,2) == subm(m,range<1,2>(),range<1,2>()),"");
matrix<double,2,2> m2 = subm(m,range<0,2,2>(),range<0,2,2>());
DLIB_CASSERT(m2(0,0) == m(0,0),"");
DLIB_CASSERT(m2(0,1) == m(0,2),"");
DLIB_CASSERT(m2(1,0) == m(2,0),"");
DLIB_CASSERT(m2(1,1) == m(2,2),"");
}
} }
......
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