slice::slice
Defines a subset of a valarray that consists of a number of elements that are an equal distance apart and that start at a specified element.
slice( );
slice(
size_t _StartIndex,
size_t _Len,
size_t _Stride
);
Parameters
_StartIndex
The valarray index of the first element in the subset._Len
The number of elements in the subset._Stride
The distance between elements in the subset.
Return Value
The default constructor stores zeros for the starting index, total length, and stride. The second constructor stores _StartIndex for the starting index, _Len for the total length, and _Stride for the stride.
Remarks
The stride may be negative.
Example
// slice_ctor.cpp
// compile with: /EHsc
#include <valarray>
#include <iostream>
int main( )
{
using namespace std;
int i;
valarray<int> va ( 20 ), vaResult;
for ( i = 0 ; i < 20 ; i+=1 )
va [ i ] = 2 * (i + 1 );
cout << "The operand valarray va is:\n( ";
for ( i = 0 ; i < 20 ; i++ )
cout << va [ i ] << " ";
cout << ")." << endl;
slice vaSlice ( 1 , 7 , 3 );
vaResult = va [ vaSlice ];
cout << "\nThe slice of valarray va is vaResult:"
<< "\nva[slice( 1, 7, 3)] = ( ";
for ( i = 0 ; i < 7 ; i++ )
cout << vaResult [ i ] << " ";
cout << ")." << endl;
}
The operand valarray va is: ( 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 ). The slice of valarray va is vaResult: va[slice( 1, 7, 3)] = ( 4 10 16 22 28 34 40 ).
Requirements
Header: <valarray>
Namespace: std