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

See Also

Reference

gslice Class

Other Resources

gslice Members