public member function
<valarray>
valarray<T> cshift (int n) const;
Cyclically shift elements
Returns a valarray with its elements rotated left
n spaces (or right if
n is negative).
The valarray returned has the same length as
*this.
By cyclically shifting (rotating) an array, the
I-th element in the resulting valarray corresponds to the element with position
(I+n)%size() in the original valarray.
Unlike with
valarray::shift, the valarray returned by
cshift does not initialize new elements with their default constructor to fill the
last
n elements in
*this (or the first
-n elements if
n is negative). Instead, it uses the first (or last) elements of
*this.
Parameters
- n
- Number of elements to rotate. If positive, it is rotated left. If negative, it is rotated right.
Return value
A
valarray object with the elements of
*this rotated
n spaces.
Example
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
|
// valarray::cshift example
#include <iostream>
#include <valarray>
using namespace std;
int main ()
{
int init[]={10,20,30,40,50};
valarray<int> myvalarray (init,5); // 10 20 30 40 50
myvalarray = myvalarray.cshift(2); // 30 40 50 10 20
myvalarray = myvalarray.cshift(-1); // 20 30 40 50 10
for (size_t n=0; n<myvalarray.size(); n++)
cout << myvalarray[n] << ' ';
cout << endl;
return 0;
}
|
Output:
See also
- valarray::shift
- Shift elements (public member function)
- valarray operators
- Valarray operators (function)