gslice::stride
Finds the distance between elements in a general slice of a valarray.
valarray<size_t> stride( ) const;
Return Value
A valarray specifying the distances between elements in each slice of a general slice of a valarray.
Example
// gslice_stride.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 ] = i;
cout << "The operand valarray va is:\n ( ";
for (i = 0 ; i < 20 ; i++ )
cout << va [ i ] << " ";
cout << ")." << endl;
valarray<size_t> Len ( 2 ), Stride ( 2 );
Len [0] = 4;
Len [1] = 4;
Stride [0] = 7;
Stride [1] = 4;
gslice vaGSlice ( 0, Len, Stride );
vaResult = va [ vaGSlice ];
const valarray <size_t> strideGS = vaGSlice.stride ( );
cout << "The valarray for vaGSlice is vaResult:"
<< "\n va[vaGSlice] = ( ";
for ( i = 0 ; i < 8 ; i++ )
cout << vaResult [ i ] << " ";
cout << ")." << endl;
cout << "The strides of vaResult are:"
<< "\n vaGSlice.stride ( ) = ( ";
for ( i = 0 ; i < 2 ; i++ )
cout << strideGS[ i ] << " ";
cout << ")." << endl;
}
The operand valarray va is: ( 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 ). The valarray for vaGSlice is vaResult: va[vaGSlice] = ( 0 4 8 12 7 11 15 19 ). The strides of vaResult are: vaGSlice.stride ( ) = ( 7 4 ).
Requirements
Header: <valarray>
Namespace: std