PROD  PROD Product Function


Usage
 
 Computes the product of an array along a given dimension.  The general
 syntax for its use is
 
    y = prod(x,d)
 
 where x is an n-dimensions array of numerical type.
 The output is of the same numerical type as the input, except 
 for integer types, which are automatically promoted to int32.
  The argument d is optional, and denotes the dimension along 
 which to take the product.  The output is computed via
 If d is omitted, then the product is taken along the 
 first non-singleton dimension of x. 
 