From: "godsofmetal" <godsofmetal AT tiscalinet DOT it>
Newsgroups: comp.os.msdos.djgpp
Subject: For loops.
Date: Thu, 29 Jun 2000 10:27:18 +0200
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

I've got big problems with a for loop into another for loop.
I report below the piece of code.

---------------------
sgenrand(rand() %(RAND_MAX+1)); // Random seed of the pseudorandom sequence
for (int i=0;  i< no_steps; ++i)
        {
          double y = genrand1(); // random numbers
          S_t = S_t * exp(R + SD * cndev(y));
          prices[i]=S_t;   // The array

        };

    //..... some manipulations
    double price = sum_c_max* (exp (-r*time));  // The result
---------------------

I'd like to calculate "double price" n times with different random numbers
in order to obtain the average of such values.
I thought that i needed to put this process into another for loop.
But i don't know how to do that.
I did as follows, but that gives wrong results:

for (int j=0;  j< no_paths; ++j)
{
    sgenrand(rand() %(RAND_MAX+1));

   for (int i=0;  i< no_steps; ++i)
          {

            double y = genrand1();
            S_t = S_t * exp(R + SD * cndev(y));
            prices[i]=S_t;

          };


    m = *max_element(prices.begin(),prices.end()); // the max value of the
array
    tx = prices.back(); // the last value
    if (m > bar)
    sum_c_max  += max(0.0, tx - X) ;
}
    double price = sum_c_max * exp (-r*time) / no_paths;

Could anyone help me?

MAX