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valarray::operator*= 

Multiplies the elements of a specified valarray or a value of the element type, element-wise, to an operand valarray.


valarray<Type>& operator*=(
   const valarray<Type>& _Right
);
valarray<Type>& operator*=(
   const Type& _Right
);

Parameters

_Right

The valarray or value of an element type identical to that of the operand valarray that is to multiply, element-wise, the operand valarray.

A valarray whose elements are the element-wise product of the operand valarray and _Right.

// valarray_op_emult.cpp
// compile with: /EHsc
#include <valarray>
#include <iostream>

int main( )
{
   using namespace std;
   int i;

   valarray<int> vaL ( 8 ), vaR ( 8 );
   for ( i = 0 ; i < 8 ; i += 2 )
      vaL [ i ] =  2;
   for ( i = 1 ; i < 8 ; i += 2 )
      vaL [ i ] =  -1;
   for ( i = 0 ; i < 8 ; i++ )
      vaR [ i ] =  i;
   
   cout << "The initial valarray is: ( ";
      for ( i = 0 ; i < 8 ; i++ )
         cout << vaL [ i ] << " ";
   cout << ")." << endl;

   cout << "The initial Right valarray is: ( ";
      for ( i = 0 ; i < 8 ; i++ )
         cout << vaR [ i ] << " ";
   cout << ")." << endl;

   vaL *= vaR;
   cout << "The element-by-element result of "
        << "the multiplication is the\n valarray: ( ";
      for ( i = 0 ; i < 8 ; i++ )
         cout << vaL [ i ] << " ";
   cout << ")." << endl;
}

Output

The initial valarray is: ( 2 -1 2 -1 2 -1 2 -1 ).
The initial Right valarray is: ( 0 1 2 3 4 5 6 7 ).
The element-by-element result of the multiplication is the
 valarray: ( 0 -1 4 -3 8 -5 12 -7 ).

Header: <valarray>

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