std::slice

 

C++

Sprache

Concepts

Utilities-Bibliothek

Strings Bibliothek

Container-Bibliothek

Algorithmen-Bibliothek

Iteratoren Bibliothek

Numerik-Bibliothek

Input / Output-Bibliothek

Lokalisierungen Bibliothek

Reguläre Ausdrücke Bibliothek(C++11)

Atomare Operationen Bibliothek(C++11)

Thread Support-Bibliothek(C++11)

 

Numerik-Bibliothek

Gemeinsame mathematischen Funktionen

Floating-Point-Umgebung

Komplexe Zahlen

Numerische Arrays

Pseudo-Zufallszahlen

Compile-time rationale Arithmetik(C++11)

Generische numerische Operationen Original: Generic numeric operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

iota (C++11)

accumulate

inner_product

adjacent_difference

partial_sum

 

std::valarray

Member-Funktionen Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
valarray::valarray valarray::~valarray valarray::operator= valarray::operator[] valarray::swap valarray::size valarray::resize valarray::sum valarray::min valarray::max valarray::shift valarray::cshift valarray::apply	valarray::operator+ valarray::operator- valarray::operator~ valarray::operator! valarray::operator+= valarray::operator-= valarray::operator*= valarray::operator/= valarray::operator%= valarray::operator&= valarray::operator|= valarray::operator^= valarray::operator<<= valarray::operator>>=
Non-Member-Funktionen Original: Non-member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
swap (C++11) begin (C++11) end (C++11) abs exp log log10 pow sqrt sin cos tan asin acos atan atan2 sinh cosh tanh	operator* operator/ operator% operator+ operator- operator^ None operator& operator| operator<< operator>> operator&& operator None operator== operator!= operator< operator> operator<= operator>=
Helper-Klassen Original: Helper classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
slice_array gslice_array indirect_array	slice gslice mask_array

 

definiert in Header <valarray>
class slice;

std::slice ist der Selektor Klasse, die eine Teilmenge von std::valarray ähnlich BLAS Scheibe identifiziert. Ein Objekt des Typs std::slice hält drei Werte: die Startindex, die Schrittlänge und die Gesamtzahl der Werte in der Teilmenge. Objekte vom Typ std::slice können als Indizes mit valarray die operator[] verwendet werden .

Original:

std::slice is the selector class that identifies a subset of std::valarray similar to BLAS slice. An object of type std::slice holds three values: the starting index, the stride, and the total number of values in the subset. Objects of type std::slice can be used as indexes with valarray's operator[].

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Member-Funktionen

(constructor)	baut eine Scheibe Original: constructs a slice The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion)
start	greift auf den Start der Scheibe Original: accesses the start of the slice The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion)
size	greift auf die Größe der Scheibe Original: accesses the size of the slice The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion)
stride	greift die Schrittlänge der Scheibe Original: accesses the stride of the slice The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion)

Beispiel

Barebones valarray-backed Matrix-Klasse mit einem verfolgen Rechenfunktion .

Original:

Barebones valarray-backed Matrix class with a verfolgen calculating function.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

#include <iostream>#include <valarray>class Matrix {std::valarray<int> data;int dim;public: Matrix(int r, int c): data(r*c), dim(c){}int& operator()(int r, int c){return data[r*dim + c];}int trace()const{return data[std::slice(0, dim, dim+1)].sum();}};int main(){ Matrix m(3,3);int n =0;for(int r=0; r<3;++r)for(int c=0; c<3;++c) m(r, c)=++n;std::cout<<"Trace of the matrix (1,2,3) (4,5,6) (7,8,9) is "<< m.trace()<<'\n';}

Output:

Trace of the matrix (1,2,3) (4,5,6) (7,8,9) is 15

Siehe auch

operator[]	get / set valarray Element, Scheibe, oder Maske Original: get/set valarray element, slice, or mask The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion)
gslice	generalisierte Scheibe eines valarray: Startindex, Längen eingestellt, der Fortschritte festgelegt Original: generalized slice of a valarray: starting index, set of lengths, set of strides The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Klasse)
slice_array	Proxy auf eine Teilmenge eines valarray nach Anwendung einer Scheibe Original: proxy to a subset of a valarray after applying a slice The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Klassen-Template)