"Examples/Basics/Arrays/Array/Array.pde" has an overflow? at the middle index. For example, run this snippet and look at index 200 (because the width of the window is 400).

float[] coswave;

void setup()
{
 size(400, 300);
 coswave = new float[width];

 for(int i = 0; i < width; ++i)
 {
   float amount = map(i,        // number to map
                      0, width, // map from this range
                      0, PI);   // to this range

   coswave[i] = abs(cos(amount));

   if(i == width/2)
   {    
          println("**********************************");
          println("amount = " + amount);
          println("cos(" + amount + ") = " + cos(amount));
          println("coswave[" + i + "] = " + coswave[i]);
          println("**********************************");    
   }
   else
     println("coswave[" + i + "] = " + coswave[i]);
 }
}

Now change the width to 399, no overflow. I'm curious as to why...

Regards.

perhaps overflow is a poor choice of wording.

basically, on index 200 i get:

amount = 1.5707964 // 90 degrees
cos(amount) = -4.371139E-8

and in google calc it's:
cos(1.5707964) = -7.32051035 × 10-8

sorry, all confused. i was thinking of an int overflow wrapping and i forgot about exponents, shift the decimal over 8 places and u've got a really big 0

thx