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Mathematical Functions |
Namespaces | |
vigra | |
Classes | |
class | BSpline< ORDER, T > |
class | BSplineBase< ORDER, T > |
class | CatmullRomSpline< T > |
class | CoscotFunction< T > |
class | Gaussian< T > |
Functions | |
template<class IndexIterator , class InIterator , class OutIterator > | |
void | applyPermutation (IndexIterator index_first, IndexIterator index_last, InIterator in, OutIterator out) |
Sort an array according to the given index permutation. More... | |
template<class Iterator > | |
Iterator | argMax (Iterator first, Iterator last) |
Find the maximum element in a sequence. More... | |
template<class Iterator , class UnaryFunctor > | |
Iterator | argMaxIf (Iterator first, Iterator last, UnaryFunctor condition) |
Find the maximum element in a sequence conforming to a condition. More... | |
template<class Iterator > | |
Iterator | argMin (Iterator first, Iterator last) |
Find the minimum element in a sequence. More... | |
template<class Iterator , class UnaryFunctor > | |
Iterator | argMinIf (Iterator first, Iterator last, UnaryFunctor condition) |
Find the minimum element in a sequence conforming to a condition. More... | |
double | besselJ (int n, double x) |
Bessel function of the first kind. More... | |
double | besselY (int n, double x) |
Bessel function of the second kind. More... | |
UInt32 | ceilPower2 (UInt32 x) |
Round up to the nearest power of 2. More... | |
UInt32 | checksum (const char *data, unsigned int size) |
Compute the CRC-32 checksum of a byte array. More... | |
double | chi2 (unsigned int degreesOfFreedom, double arg, double accuracy=1e-7) |
Chi square distribution. More... | |
double | chi2CDF (unsigned int degreesOfFreedom, double arg, double accuracy=1e-7) |
Cumulative chi square distribution. More... | |
template<class T1 , class T2 > | |
bool | closeAtTolerance (T1 l, T2 r, typename PromoteTraits< T1, T2 >::Promote epsilon) |
Tolerance based floating-point equality. More... | |
UInt32 | concatenateChecksum (UInt32 checksum, const char *data, unsigned int size) |
template<class REAL > | |
REAL | cos_pi (REAL x) |
cos(pi*x). More... | |
double | ellipticIntegralE (double x, double k) |
The incomplete elliptic integral of the second kind. More... | |
double | ellipticIntegralF (double x, double k) |
The incomplete elliptic integral of the first kind. More... | |
bool | even (int t) |
Check if an integer is even. More... | |
UInt32 | floorPower2 (UInt32 x) |
Round down to the nearest power of 2. More... | |
double | gamma (double x) |
The gamma function. More... | |
template<typename IntType > | |
IntType | gcd (IntType n, IntType m) |
template<class T1 , class T2 > | |
bool | greaterEqualAtTolerance (T1 l, T2 r, typename PromoteTraits< T1, T2 >::Promote epsilon) |
Tolerance based floating-point greater-or-equal. More... | |
template<class Iterator , class IndexIterator , class Compare > | |
void | indexSort (Iterator first, Iterator last, IndexIterator index_first, Compare c) |
Return the index permutation that would sort the input array. More... | |
template<... > | |
void | inspectSequence (...) |
Call an analyzing functor at every element of a sequence. More... | |
template<class InIterator , class OutIterator > | |
void | inversePermutation (InIterator first, InIterator last, OutIterator out) |
Compute the inverse of a given permutation. More... | |
bool | isPower2 (UInt32 x) |
Determine whether x is a power of 2 Bit twiddle from https://graphics.stanford.edu/~seander/bithacks.html#DetermineIfPowerOf2. | |
template<typename IntType > | |
IntType | lcm (IntType n, IntType m) |
template<class REAL > | |
REAL | legendre (unsigned int l, int m, REAL x) |
Associated Legendre polynomial. More... | |
template<class REAL > | |
REAL | legendre (unsigned int l, REAL x) |
Legendre polynomial. More... | |
template<class T1 , class T2 > | |
bool | lessEqualAtTolerance (T1 l, T2 r, typename PromoteTraits< T1, T2 >::Promote epsilon) |
Tolerance based floating-point less-or-equal. More... | |
template<class Iterator , class Value > | |
void | linearSequence (Iterator first, Iterator last, Value start, Value step) |
Fill an array with a sequence of numbers. More... | |
Int32 | log2i (UInt32 x) |
Compute the base-2 logarithm of an integer. More... | |
double | loggamma (double x) |
The natural logarithm of the gamma function. More... | |
template<class ArrayLike , class Compare > | |
detail::IndexCompare < ArrayLike, Compare > | makeIndexComparator (ArrayLike a, Compare c) |
Create a compare functor for indirect sort. More... | |
double | noncentralChi2 (unsigned int degreesOfFreedom, double noncentrality, double arg, double accuracy=1e-7) |
Non-central chi square distribution. More... | |
double | noncentralChi2CDF (unsigned int degreesOfFreedom, double noncentrality, double arg, double accuracy=1e-7) |
Cumulative non-central chi square distribution. More... | |
double | noncentralChi2CDFApprox (unsigned int degreesOfFreedom, double noncentrality, double arg) |
Cumulative non-central chi square distribution (approximate). More... | |
template<class T > | |
NormTraits< T >::NormType | norm (T const &t) |
The norm of a numerical object. More... | |
bool | odd (int t) |
Check if an integer is odd. More... | |
result_type | operator() (argument_type x) const |
template<unsigned n, class V > | |
V | power (const V &x) |
Exponentiation to a positive integer power by squaring. More... | |
REAL | round (REAL v) |
The rounding function. More... | |
long long | roundi (double t) |
Round and cast to integer. More... | |
template<class T > | |
T | sign (T t) |
The sign function. More... | |
template<class T1 , class T2 > | |
T1 | sign (T1 t1, T2 t2) |
The binary sign function. More... | |
template<class T > | |
int | signi (T t) |
The integer sign function. More... | |
template<class REAL > | |
REAL | sin_pi (REAL x) |
sin(pi*x). More... | |
template<class T > | |
NumericTraits< T >::Promote | sq (T t) |
The square function. More... | |
Int32 | sqrti (Int32 v) |
Signed integer square root. More... | |
NormTraits< T >::SquaredNormType | squaredNorm (T const &t) |
The squared norm of a numerical object. More... | |
template<class T > | |
void | symmetric2x2Eigenvalues (T a00, T a01, T a11, T *r0, T *r1) |
Compute the eigenvalues of a 2x2 real symmetric matrix. More... | |
template<class T > | |
void | symmetric3x3Eigenvalues (T a00, T a01, T a02, T a11, T a12, T a22, T *r0, T *r1, T *r2) |
Compute the eigenvalues of a 3x3 real symmetric matrix. More... | |
Useful mathematical functions and functors.
Iterator vigra::argMin | ( | Iterator | first, |
Iterator | last | ||
) |
Find the minimum element in a sequence.
The function returns the iterator referring to the minimum element. This is identical to the function std::min_element()
.
Required Interface:
#include <vigra/algorithm.hxx>
Namespace: vigra
Iterator vigra::argMax | ( | Iterator | first, |
Iterator | last | ||
) |
Find the maximum element in a sequence.
The function returns the iterator referring to the maximum element. This is identical to the function std::max_element()
.
Required Interface:
#include <vigra/algorithm.hxx>
Namespace: vigra
Iterator vigra::argMinIf | ( | Iterator | first, |
Iterator | last, | ||
UnaryFunctor | condition | ||
) |
Find the minimum element in a sequence conforming to a condition.
The function returns the iterator referring to the minimum element, where only elements conforming to the condition (i.e. where condition(*iterator)
evaluates to true
) are considered. If no element conforms to the condition, or the sequence is empty, the end iterator last is returned.
Required Interface:
#include <vigra/algorithm.hxx>
Namespace: vigra
Iterator vigra::argMaxIf | ( | Iterator | first, |
Iterator | last, | ||
UnaryFunctor | condition | ||
) |
Find the maximum element in a sequence conforming to a condition.
The function returns the iterator referring to the maximum element, where only elements conforming to the condition (i.e. where condition(*iterator)
evaluates to true
) are considered. If no element conforms to the condition, or the sequence is empty, the end iterator last is returned.
Required Interface:
#include <vigra/algorithm.hxx>
Namespace: vigra
void vigra::linearSequence | ( | Iterator | first, |
Iterator | last, | ||
Value | start, | ||
Value | step | ||
) |
Fill an array with a sequence of numbers.
The sequence starts at start and is incremented with step. Default start and stepsize are 0 and 1 respectively. This is a generalization of function std::iota()
in C++11.
Declaration:
Required Interface:
#include <vigra/algorithm.hxx>
Namespace: vigra
void vigra::inspectSequence | ( | ... | ) |
Call an analyzing functor at every element of a sequence.
This function can be used to collect statistics of the sequence [first, last)
defined by these two input interators. The results must be stored in the functor, which serves as a return value.
Declarations:
Usage:
#include <vigra/algorithm.hxx>
Namespace: vigra
detail::IndexCompare<ArrayLike, Compare> vigra::makeIndexComparator | ( | ArrayLike | a, |
Compare | c | ||
) |
Create a compare functor for indirect sort.
Indirect sorting refers to the situation where you have an array holding data and another array holding indices referencing the first array, and you want to sort the index array according to some property of the data array without changing the data array itself. The factory function makeIndexComparator()
creates a sorting predicate for this task, given a sorting predicate for the data array.
Usage:
#include <vigra/algorithm.hxx>
Namespace: vigra
Declarations:
void vigra::indexSort | ( | Iterator | first, |
Iterator | last, | ||
IndexIterator | index_first, | ||
Compare | c | ||
) |
Return the index permutation that would sort the input array.
To actually sort an array according to the ordering thus determined, use applyPermutation().
Usage:
#include <vigra/algorithm.hxx>
Namespace: vigra
Declarations:
Required Interface:
#include <vigra/algorithm.hxx>
Namespace: vigra
void vigra::applyPermutation | ( | IndexIterator | index_first, |
IndexIterator | index_last, | ||
InIterator | in, | ||
OutIterator | out | ||
) |
Sort an array according to the given index permutation.
The iterators in and out may not refer to the same array, as this would overwrite the input prematurely.
Declaration:
Required Interface:
#include <vigra/algorithm.hxx>
Namespace: vigra
void vigra::inversePermutation | ( | InIterator | first, |
InIterator | last, | ||
OutIterator | out | ||
) |
Compute the inverse of a given permutation.
This is just another name for indexSort(), referring to another semantics.
Declaration:
Required Interface:
#include <vigra/algorithm.hxx>
Namespace: vigra
UInt32 vigra::checksum | ( | const char * | data, |
unsigned int | size | ||
) |
Compute the CRC-32 checksum of a byte array.
Implementation note: This function is slower on big-endian machines because the "4 bytes at a time" optimization is only implemented for little-endian.
UInt32 vigra::concatenateChecksum | ( | UInt32 | checksum, |
const char * | data, | ||
unsigned int | size | ||
) |
Concatenate a byte array to an existing CRC-32 checksum.
double vigra::besselJ | ( | int | n, |
double | x | ||
) |
Bessel function of the first kind.
Computes the value of BesselJ of integer order n
and argument x
. Negative x
are unsupported and will result in a std::domain_error
.
This function wraps a number of existing implementations and falls back to a rather slow algorithm if none of them is available. In particular, it uses boost::math when HasBoostMath
is #defined, or native implementations on gcc and MSVC otherwise.
#include <vigra/bessel.hxx>
Namespace: vigra
double vigra::besselY | ( | int | n, |
double | x | ||
) |
Bessel function of the second kind.
Computes the value of BesselY of integer order n
and argument x
. Negative x
are unsupported and will result in a std::domain_error
.
This function wraps a number of existing implementations and falls back to a rather slow algorithm if none of them is available. In particular, it uses boost::math when HasBoostMath
is #defined, or native implementations on gcc and MSVC otherwise.
#include <vigra/bessel.hxx>
Namespace: vigra
REAL vigra::round | ( | REAL | v | ) |
The rounding function.
Defined for all floating point types. Rounds towards the nearest integer such that abs(round(t)) == round(abs(t))
for all t
.
#include <vigra/mathutil.hxx>
Namespace: vigra
long long vigra::roundi | ( | double | t | ) |
Round and cast to integer.
Rounds to the nearest integer like round(), but casts the result to long long
(this will be faster and is usually needed anyway).
#include <vigra/mathutil.hxx>
Namespace: vigra
UInt32 vigra::ceilPower2 | ( | UInt32 | x | ) |
Round up to the nearest power of 2.
Efficient algorithm for finding the smallest power of 2 which is not smaller than x (function clp2() from Henry Warren: "Hacker's Delight", Addison-Wesley, 2003, see http://www.hackersdelight.org/). If x > 2^31, the function will return 0 because integer arithmetic is defined modulo 2^32.
#include <vigra/mathutil.hxx>
Namespace: vigra
UInt32 vigra::floorPower2 | ( | UInt32 | x | ) |
Round down to the nearest power of 2.
Efficient algorithm for finding the largest power of 2 which is not greater than x (function flp2() from Henry Warren: "Hacker's Delight", Addison-Wesley, 2003, see http://www.hackersdelight.org/).
#include <vigra/mathutil.hxx>
Namespace: vigra
Int32 vigra::log2i | ( | UInt32 | x | ) |
Compute the base-2 logarithm of an integer.
Returns the position of the left-most 1-bit in the given number x, or -1 if x == 0. That is,
The function uses Robert Harley's algorithm to determine the number of leading zeros in x (algorithm nlz10() at http://www.hackersdelight.org/). But note that the functions floorPower2() or ceilPower2() are more efficient and should be preferred when possible.
#include <vigra/mathutil.hxx>
Namespace: vigra
NumericTraits<T>::Promote vigra::sq | ( | T | t | ) |
The square function.
sq(x) = x*x
is needed so often that it makes sense to define it as a function.
#include <vigra/mathutil.hxx>
Namespace: vigra
V vigra::power | ( | const V & | x | ) |
Exponentiation to a positive integer power by squaring.
#include <vigra/mathutil.hxx>
Namespace: vigra
UInt32 sqrti | ( | Int32 | v | ) |
Signed integer square root.
Unsigned integer square root.
Useful for fast fixed-point computations.
#include <vigra/mathutil.hxx>
Namespace: vigra
T vigra::sign | ( | T | t | ) |
The sign function.
Returns 1, 0, or -1 depending on the sign of t, but with the same type as t.
#include <vigra/mathutil.hxx>
Namespace: vigra
int vigra::signi | ( | T | t | ) |
The integer sign function.
Returns 1, 0, or -1 depending on the sign of t, converted to int.
#include <vigra/mathutil.hxx>
Namespace: vigra
T1 vigra::sign | ( | T1 | t1, |
T2 | t2 | ||
) |
The binary sign function.
Transfers the sign of t2 to t1.
#include <vigra/mathutil.hxx>
Namespace: vigra
bool vigra::even | ( | int | t | ) |
Check if an integer is even.
Defined for all integral types.
bool vigra::odd | ( | int | t | ) |
Check if an integer is odd.
Defined for all integral types.
NormTraits<T>::SquaredNormType vigra::squaredNorm | ( | T const & | t | ) |
The squared norm of a numerical object.
vigra::sq(t)
. vigra::dot(t, t)
. vigra::sq(t.real()) + vigra::sq(t.imag())
. NormTraits<T>::NormType vigra::norm | ( | T const & | t | ) |
The norm of a numerical object.
For scalar types: implemented as abs(t)
otherwise: implemented as sqrt(squaredNorm(t))
.
#include <vigra/mathutil.hxx>
Namespace: vigra
void vigra::symmetric2x2Eigenvalues | ( | T | a00, |
T | a01, | ||
T | a11, | ||
T * | r0, | ||
T * | r1 | ||
) |
Compute the eigenvalues of a 2x2 real symmetric matrix.
This uses the analytical eigenvalue formula
#include <vigra/mathutil.hxx>
Namespace: vigra
void vigra::symmetric3x3Eigenvalues | ( | T | a00, |
T | a01, | ||
T | a02, | ||
T | a11, | ||
T | a12, | ||
T | a22, | ||
T * | r0, | ||
T * | r1, | ||
T * | r2 | ||
) |
Compute the eigenvalues of a 3x3 real symmetric matrix.
This uses a numerically stable version of the analytical eigenvalue formula according to
David Eberly: "Eigensystems for 3 x 3 Symmetric Matrices (Revisited)", Geometric Tools Documentation, 2006
#include <vigra/mathutil.hxx>
Namespace: vigra
double vigra::ellipticIntegralF | ( | double | x, |
double | k | ||
) |
The incomplete elliptic integral of the first kind.
This function computes
according to the algorithm given in Press et al. "Numerical Recipes".
Note: In some libraries (e.g. Mathematica), the second parameter of the elliptic integral functions must be k^2 rather than k. Check the documentation when results disagree!
#include <vigra/mathutil.hxx>
Namespace: vigra
double vigra::ellipticIntegralE | ( | double | x, |
double | k | ||
) |
The incomplete elliptic integral of the second kind.
This function computes
according to the algorithm given in Press et al. "Numerical Recipes". The complete elliptic integral of the second kind is simply ellipticIntegralE(M_PI/2, k)
.
Note: In some libraries (e.g. Mathematica), the second parameter of the elliptic integral functions must be k^2 rather than k. Check the documentation when results disagree!
#include <vigra/mathutil.hxx>
Namespace: vigra
double vigra::chi2 | ( | unsigned int | degreesOfFreedom, |
double | arg, | ||
double | accuracy = 1e-7 |
||
) |
Chi square distribution.
Computes the density of a chi square distribution with degreesOfFreedom and tolerance accuracy at the given argument arg by calling noncentralChi2(degreesOfFreedom, 0.0, arg, accuracy)
.
#include <vigra/mathutil.hxx>
Namespace: vigra
double vigra::chi2CDF | ( | unsigned int | degreesOfFreedom, |
double | arg, | ||
double | accuracy = 1e-7 |
||
) |
Cumulative chi square distribution.
Computes the cumulative density of a chi square distribution with degreesOfFreedom and tolerance accuracy at the given argument arg, i.e. the probability that a random number drawn from the distribution is below arg by calling noncentralChi2CDF(degreesOfFreedom, 0.0, arg, accuracy)
.
#include <vigra/mathutil.hxx>
Namespace: vigra
double vigra::noncentralChi2 | ( | unsigned int | degreesOfFreedom, |
double | noncentrality, | ||
double | arg, | ||
double | accuracy = 1e-7 |
||
) |
Non-central chi square distribution.
Computes the density of a non-central chi square distribution with degreesOfFreedom, noncentrality parameter noncentrality and tolerance accuracy at the given argument arg. It uses Algorithm AS 231 from Appl. Statist. (1987) Vol.36, No.3 (code ported from http://lib.stat.cmu.edu/apstat/231). The algorithm has linear complexity in the number of degrees of freedom.
#include <vigra/mathutil.hxx>
Namespace: vigra
double vigra::noncentralChi2CDF | ( | unsigned int | degreesOfFreedom, |
double | noncentrality, | ||
double | arg, | ||
double | accuracy = 1e-7 |
||
) |
Cumulative non-central chi square distribution.
Computes the cumulative density of a chi square distribution with degreesOfFreedom, noncentrality parameter noncentrality and tolerance accuracy at the given argument arg, i.e. the probability that a random number drawn from the distribution is below arg It uses Algorithm AS 231 from Appl. Statist. (1987) Vol.36, No.3 (code ported from http://lib.stat.cmu.edu/apstat/231). The algorithm has linear complexity in the number of degrees of freedom (see noncentralChi2CDFApprox() for a constant-time algorithm).
#include <vigra/mathutil.hxx>
Namespace: vigra
double vigra::noncentralChi2CDFApprox | ( | unsigned int | degreesOfFreedom, |
double | noncentrality, | ||
double | arg | ||
) |
Cumulative non-central chi square distribution (approximate).
Computes approximate values of the cumulative density of a chi square distribution with degreesOfFreedom, and noncentrality parameter noncentrality at the given argument arg, i.e. the probability that a random number drawn from the distribution is below arg It uses the approximate transform into a normal distribution due to Wilson and Hilferty (see Abramovitz, Stegun: "Handbook of Mathematical Functions", formula 26.3.32). The algorithm's running time is independent of the inputs, i.e. is should be used when noncentralChi2CDF() is too slow, and approximate values are sufficient. The accuracy is only about 0.1 for few degrees of freedom, but reaches about 0.001 above dof = 5.
#include <vigra/mathutil.hxx>
Namespace: vigra
REAL vigra::legendre | ( | unsigned int | l, |
int | m, | ||
REAL | x | ||
) |
Associated Legendre polynomial.
Computes the value of the associated Legendre polynomial of order l, m
for argument x
. x
must be in the range [-1.0, 1.0]
, otherwise an exception is thrown. The standard Legendre polynomials are the special case m == 0
.
#include <vigra/mathutil.hxx>
Namespace: vigra
REAL vigra::legendre | ( | unsigned int | l, |
REAL | x | ||
) |
Legendre polynomial.
Computes the value of the Legendre polynomial of order l
for argument x
. x
must be in the range [-1.0, 1.0]
, otherwise an exception is thrown.
#include <vigra/mathutil.hxx>
Namespace: vigra
REAL vigra::sin_pi | ( | REAL | x | ) |
sin(pi*x).
Essentially calls std::sin(M_PI*x)
but uses a more accurate implementation to make sure that sin_pi(1.0) == 0.0
(which does not hold for std::sin(M_PI)
due to round-off error), and sin_pi(0.5) == 1.0
.
#include <vigra/mathutil.hxx>
Namespace: vigra
REAL vigra::cos_pi | ( | REAL | x | ) |
cos(pi*x).
Essentially calls std::cos(M_PI*x)
but uses a more accurate implementation to make sure that cos_pi(1.0) == -1.0
and cos_pi(0.5) == 0.0
.
#include <vigra/mathutil.hxx>
Namespace: vigra
double vigra::gamma | ( | double | x | ) |
The gamma function.
This function implements the algorithm from
Zhang and Jin: "Computation of Special Functions", John Wiley and Sons, 1996.
The argument must be <= 171.0 and cannot be zero or a negative integer. An exception is thrown when these conditions are violated.
#include <vigra/mathutil.hxx>
Namespace: vigra
double vigra::loggamma | ( | double | x | ) |
The natural logarithm of the gamma function.
This function is based on a free implementation by Sun Microsystems, Inc., see sourceware.org archive. It can be removed once all compilers support the new C99 math functions.
The argument must be positive and < 1e30. An exception is thrown when these conditions are violated.
#include <vigra/mathutil.hxx>
Namespace: vigra
bool vigra::closeAtTolerance | ( | T1 | l, |
T2 | r, | ||
typename PromoteTraits< T1, T2 >::Promote | epsilon | ||
) |
Tolerance based floating-point equality.
Check whether two floating point numbers are equal within the given tolerance. This is useful because floating point numbers that should be equal in theory are rarely exactly equal in practice. If the tolerance epsilon is not given, twice the machine epsilon is used.
#include <vigra/mathutil.hxx>
Namespace: vigra
bool vigra::lessEqualAtTolerance | ( | T1 | l, |
T2 | r, | ||
typename PromoteTraits< T1, T2 >::Promote | epsilon | ||
) |
Tolerance based floating-point less-or-equal.
Check whether two floating point numbers are less or equal within the given tolerance. That is, l can actually be greater than r within the given epsilon. This is useful because floating point numbers that should be equal in theory are rarely exactly equal in practice. If the tolerance epsilon is not given, twice the machine epsilon is used.
#include <vigra/mathutil.hxx>
Namespace: vigra
bool vigra::greaterEqualAtTolerance | ( | T1 | l, |
T2 | r, | ||
typename PromoteTraits< T1, T2 >::Promote | epsilon | ||
) |
Tolerance based floating-point greater-or-equal.
Check whether two floating point numbers are greater or equal within the given tolerance. That is, l can actually be less than r within the given epsilon. This is useful because floating point numbers that should be equal in theory are rarely exactly equal in practice. If the tolerance epsilon is not given, twice the machine epsilon is used.
#include <vigra/mathutil.hxx>
Namespace: vigra
IntType vigra::gcd | ( | IntType | n, |
IntType | m | ||
) |
Calculate the greatest common divisor.
This function works for arbitrary integer types, including user-defined (e.g. infinite precision) ones.
#include <vigra/rational.hxx>
Namespace: vigra
IntType vigra::lcm | ( | IntType | n, |
IntType | m | ||
) |
Calculate the lowest common multiple.
This function works for arbitrary integer types, including user-defined (e.g. infinite precision) ones.
#include <vigra/rational.hxx>
Namespace: vigra
CatmullRomSpline< T >::result_type operator() | ( | argument_type | x | ) | const |
function (functor) call
© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de) |
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