/usr/include/armadillo_bits/fn_n_unique.hpp is in libarmadillo-dev 1:4.200.0+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 | // Copyright (C) 2012 Ryan Curtin
// Copyright (C) 2012 Conrad Sanderson
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
//! \addtogroup fn_n_unique
//! @{
//! \brief
//! Get the number of unique nonzero elements in two sparse matrices.
//! This is very useful for determining the amount of memory necessary before
//! a sparse matrix operation on two matrices.
template<typename T1, typename T2, typename op_n_unique_type>
inline
uword
n_unique
(
const SpBase<typename T1::elem_type, T1>& x,
const SpBase<typename T2::elem_type, T2>& y,
const op_n_unique_type junk
)
{
arma_extra_debug_sigprint();
const SpProxy<T1> pa(x.get_ref());
const SpProxy<T2> pb(y.get_ref());
return n_unique(pa,pb,junk);
}
template<typename T1, typename T2, typename op_n_unique_type>
arma_hot
inline
uword
n_unique
(
const SpProxy<T1>& pa,
const SpProxy<T2>& pb,
const op_n_unique_type junk
)
{
arma_extra_debug_sigprint();
arma_ignore(junk);
typename SpProxy<T1>::const_iterator_type x_it = pa.begin();
typename SpProxy<T1>::const_iterator_type x_it_end = pa.end();
typename SpProxy<T2>::const_iterator_type y_it = pb.begin();
typename SpProxy<T2>::const_iterator_type y_it_end = pb.end();
uword total_n_nonzero = 0;
while( (x_it != x_it_end) || (y_it != y_it_end) )
{
if(x_it == y_it)
{
if(op_n_unique_type::eval((*x_it), (*y_it)) != typename T1::elem_type(0))
{
++total_n_nonzero;
}
++x_it;
++y_it;
}
else
{
if((x_it.col() < y_it.col()) || ((x_it.col() == y_it.col()) && (x_it.row() < y_it.row()))) // if y is closer to the end
{
if(op_n_unique_type::eval((*x_it), typename T1::elem_type(0)) != typename T1::elem_type(0))
{
++total_n_nonzero;
}
++x_it;
}
else // x is closer to the end
{
if(op_n_unique_type::eval(typename T1::elem_type(0), (*y_it)) != typename T1::elem_type(0))
{
++total_n_nonzero;
}
++y_it;
}
}
}
return total_n_nonzero;
}
// Simple operators.
struct op_n_unique_add
{
template<typename eT> inline static eT eval(const eT& l, const eT& r) { return (l + r); }
};
struct op_n_unique_sub
{
template<typename eT> inline static eT eval(const eT& l, const eT& r) { return (l - r); }
};
struct op_n_unique_mul
{
template<typename eT> inline static eT eval(const eT& l, const eT& r) { return (l * r); }
};
struct op_n_unique_count
{
template<typename eT> inline static eT eval(const eT& l, const eT& r) { return 1; }
};
//! @}
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