Espaços nominais
Variantes
Acções

std::slice

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< cpp‎ | numeric‎ | valarray

 
 
Biblioteca numéricos
Funções matemáticas comuns
De ponto flutuante ambiente
Números complexos
Matrizes numéricas
Pseudo-aleatório de geração de números
Tempo de compilação aritmética racional (C++11)
Genéricos operações numéricas
Original:
Generic numeric operations
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iota(C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
std::valarray
Funções de membro
Original:
Member functions
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Não-membros funções
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Non-member functions
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Classes auxiliares
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Helper classes
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Defined in header <valarray>
class slice;
std::slice é a classe selector que identifica um subconjunto de std::valarray semelhante a fatia BLAS. Um objecto da std::slice tipo prende três valores: o índice de partida, o passo, e o número total de valores no subconjunto. Objectos de std::slice tipo podem ser usados ​​como índices com operator[] valarray de.
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[].
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[editar] Funções de membro

constrói uma fatia
Original:
constructs a slice
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(função pública membro)
acede ao início da fatia
Original:
accesses the start of the slice
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(função pública membro)
acede ao tamanho da fatia
Original:
accesses the size of the slice
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(função pública membro)
acessa o tranco da fatia
Original:
accesses the stride of the slice
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(função pública membro)

[editar] Exemplo

Barebones classe Matrix valarray apoiado com uma função traçar cálculo .
Original:
Barebones valarray-backed Matrix class with a traçar calculating function.
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#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

[editar] Veja também

get / set elemento valarray, uma fatia ou máscara
Original:
get/set valarray element, slice, or mask
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(função pública membro) [edit]
fatia generalizada de uma valarray: índice inicial, conjunto de comprimentos, conjunto de passos
Original:
generalized slice of a valarray: starting index, set of lengths, set of strides
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(classe) [edit]
proxy para um subconjunto de uma valarray após a aplicação de uma fatia
Original:
proxy to a subset of a valarray after applying a slice
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(modelo de classe) [edit]