std::valarray<T>::shift

valarray<T> shift( int count ) const;

Returns a new valarray of the same size with elements whose positions are shifted by count elements. The new position of each element is i−count where i is the previous position. The value of shifted in elements is T().

Parameters

count - number of positions to shift the elements by

Return value

The resulting valarray with shifted elements.

Notes

The function can be implemented with the return type different from std::valarray. In this case, the replacement type has the following properties:

Example

#include <iostream>
#include <valarray>
 
 
int main() {
    std::valarray<int> v{1, 2, 3, 4, 5, 6, 7, 8};
 
    for (auto const& val : v) {
        std::cout << val << " ";
    }
    std::cout << "\n";
 
    std::valarray<int> v2 = v.shift(2);
 
    for (auto const& val : v2) {
        std::cout << val << " ";
    }
    std::cout << "\n";
}

Output:

1 2 3 4 5 6 7 8 
3 4 5 6 7 8 0 0

See also

circular shift of the elements of the valarray
(public member function)

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