/usr/include/af/seq.h is in libarrayfire-dev 3.2.2+dfsg1-2.
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* Copyright (c) 2014, ArrayFire
* All rights reserved.
*
* This file is distributed under 3-clause BSD license.
* The complete license agreement can be obtained at:
* http://arrayfire.com/licenses/BSD-3-Clause
********************************************************/
#pragma once
#include <af/defines.h>
/**
\struct af_seq
\brief C-style struct to creating sequences for indexing
\ingroup index_mat
*/
typedef struct af_seq {
/// Start position of the sequence
double begin;
/// End position of the sequence (inclusive)
double end;
/// Step size between sequence values
double step;
} af_seq;
static const af_seq af_span = {1, 1, 0};
#ifdef __cplusplus
namespace af
{
class array;
/**
\class seq
\brief seq is used to create seq for indexing af::array
\ingroup index_mat
*/
class AFAPI seq
{
public:
///
/// \brief Get the \ref af_seq C-style struct
///
af_seq s;
///
/// \brief Get's the length of the sequence
///
size_t size;
///
/// \brief Flag for gfor
///
bool m_gfor;
/**
\brief Creates a sequence of size length as [0, 1, 2..., length - 1]
The sequence has begin as 0, end as length - 1 and step as 1.
\note When doing seq(-n), where n is > 0, then the sequence is generated as
0...-n but step remains +1. This is because when such a sequence is
used for indexing af::array, then -n represents n elements from the
end. That is, seq(-2) will imply indexing an array 0...dimSize - 2.
\code
// [begin, end, step]
seq a(10); // [0, 9, 1] => 0, 1, 2....9
\endcode
\param[in] length is the size of the seq to be created.
*/
seq(double length = 0);
/**
\brief Destructor
*/
~seq();
/**
\brief Creates a sequence starting at begin,
ending at or before end (inclusive) with increments as step.
The sequence will be [begin, begin + step, begin + 2 * step...., begin + n * step]
where the begin + n * step <= end.
\code
// [begin, end, step]
seq a(10, 20); // [10, 20, 1] => 10, 11, 12....20
seq b(10, 20, 2); // [10, 20, 2] => 10, 12, 14....20
seq c(-5, 5); // [-5, 5, 1] => -5, -4, -3....0, 1....5
seq d(-5, -15, -1); // [-5,-15, -1] => -5, -6, -7....-15
seq e(-15, -5, 1); // [-15, -5, 1] => -15, -14, -13....-5
\endcode
\param[in] begin is the start of the sequence
\param[in] end is the maximum value a sequence can take (inclusive)
\param[in] step is the increment or decrement size (default is 1)
*/
seq(double begin, double end, double step = 1);
/**
\brief Copy constructor
Creates a copy seq from another sequence.
\param[in] afs seqence to be copies
\param[in] is_gfor is the gfor flag
*/
seq(seq afs, bool is_gfor);
/**
\brief Create a seq object from an \ref af_seq struct
\param[in] s_ is the \ref af_seq struct
*/
seq(const af_seq& s_);
/**
\brief Assignment operator to create a new sequence from an af_seq
This operator creates a new sequence using the begin, end and step
from the input sequence.
\param[in] s is the input sequence
*/
seq& operator=(const af_seq& s);
/**
\brief Negation operator creates a sequence with the signs negated
begin is changed to -begin
end is changed to -end
step is changed to -step
\code
// [begin, end, step]
seq a(1, 10); // [ 1, 10, 1] => 1, 2, 3....10
seq b = -a; // [-1,-10,-1] => -1, -2, -3...-10
\endcode
*/
inline seq operator-() { return seq(-s.begin, -s.end, -s.step); }
/**
\brief Addition operator offsets the begin and end by x. There is no
change in step.
begin is changed to begin + x
end is changed to end + x
\code
// [begin, end, step]
seq a(2, 20, 2); // [2, 20, 2] => 2, 4, 6....20
seq b = a + 3; // [5, 23, 2] => 5, 7, 9....23
\endcode
*/
inline seq operator+(double x) { return seq(s.begin + x, s.end + x, s.step); }
/**
\brief Subtraction operator offsets the begin and end by x. There is no
change in step.
begin is changed to begin - x
end is changed to end - x
\code
// [begin, end, step]
seq a(10, 20, 2); // [10, 20, 2] => 10, 12, 14....20
seq b(2, 10); // [ 2, 10, 1] => 2, 3, 4....10
seq c = a - 3; // [ 7, 17, 2] => 7, 9, 11....17
seq d = b - 3; // [-1, 7, 2] => -1, 1, 3....7
\endcode
*/
inline seq operator-(double x) { return seq(s.begin - x, s.end - x, s.step); }
/**
\brief Multiplication operator spaces the sequence by a factor x.
begin is changed to begin * x
end is changed to end * x
step is changed to step * x
\code
// [begin, end, step]
seq a(10, 20, 2); // [10, 20, 2] => 10, 12, 14....20
seq b(-5, 5); // [-5, 5, 1] => -5, -4, -3....0, 1....5
seq c = a * 3; // [30, 60, 6] => 30, 36, 42....60
seq d = b * 3; // [-15, 15, 3] => -15, -12, -9....0, 3....15
seq e = a * 0.5; // [5, 10, 1] => 5, 6, 7....10
\endcode
*/
inline seq operator*(double x) { return seq(s.begin * x, s.end * x, s.step * x); }
friend inline seq operator+(double x, seq y) { return y + x; }
friend inline seq operator-(double x, seq y) { return -y + x; }
friend inline seq operator*(double x, seq y) { return y * x; }
/**
\brief Implicit conversion operator from seq to af::array
Convertes a seq object into an af::array object. The contents of the
af:array will be the explicit values from the seq.
\note Do not use this to create arrays of sequences. Use \ref range.
\code
// [begin, end, step]
seq s(10, 20, 2); // [10, 20, 2] => 10, 12, 14....20
array arr = s;
af_print(arr); // 10 12 14 16 18 20
\endcode
*/
operator array() const;
private:
void init(double begin, double end, double step);
};
extern AFAPI int end;
extern AFAPI seq span;
}
#endif
#ifdef __cplusplus
extern "C" {
#endif
AFAPI af_seq af_make_seq(double begin, double end, double step);
#ifdef __cplusplus
}
#endif
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