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std::slice

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< cpp‎ | numeric‎ | valarray

 
 
Numéricos biblioteca
Funciones matemáticas comunes
Floating-point medio ambiente
Los números complejos
Matrices numéricas
Pseudo-aleatoria de generación de números
En tiempo de compilación aritmética racional (C++11)
Genéricos operaciones numéricas
Original:
Generic numeric operations
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iota(C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
 
Defined in header <valarray>
class slice;
std::slice es el selector de clase que identifica un subconjunto de std::valarray similar a la rebanada BLAS. Un objeto de std::slice tipo tiene tres valores: el índice de inicio, la zancada, y el número total de valores en el subconjunto. Objetos std::slice tipo se puede utilizar como índices con 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] Las funciones miembro

construye una rebanada
Original:
constructs a slice
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(miembro público función)
accede al inicio de la rebanada
Original:
accesses the start of the slice
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(miembro público función)
accede al tamaño del segmento
Original:
accesses the size of the slice
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(miembro público función)
accede al paso de la rebanada
Original:
accesses the stride of the slice
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(miembro público función)

[editar] Ejemplo

Barebones valarray respaldado por Matrix clase con una función de cálculo de rastrear .
Original:
Barebones valarray-backed Matrix class with a rastrear 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] Ver también

obtener / establecer elemento valarray, sector u máscara
Original:
get/set valarray element, slice, or mask
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(miembro público función) [edit]
rebanada generalizada de un valarray: Índice de partida, establecida de longitudes, un conjunto de pasos
Original:
generalized slice of a valarray: starting index, set of lengths, set of strides
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(clase) [edit]
proxy para un subconjunto de un valarray después de la aplicación de una rebanada
Original:
proxy to a subset of a valarray after applying a slice
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(clase de plantilla) [edit]