LlAtan2

Returns a float that is the arctangent2 of y, x.

Similar to the arctangent(y/x) except it utilizes the signs of x & y to determine the quadrant and avoids division by zero. Returns zero if x and y are zero, returns PI/2 if x is zero and y is positive, returns -PI/2 if x is zero and y is negative.
The returned value is in the range [-PI, PI]^[1].

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default
{
  state_entry()
  {
    float num1 = llFrand(100.0);
    float num2 = llFrand(100.0);
 
    llOwnerSay("y = " + (string)num1);
    llOwnerSay("x = " + (string)num2);
 
    llOwnerSay("The arctangent of y divided by x is " + (string)llAtan2(num1, num2));
  }
}

//Function with input of a vector determining the position of a target and returning
//a string with the literal compass-direction of that target towards your position
//by Ramana Sweetwater 2009/01, any use allowed license :-)
//corrected by Patrick Muggins
 
string compass (vector target) 
{

   vector source = llGetPos();
   list DIRS =["W","NW","N","NE","E","SE","S","SW","W"];
   integer index = llCeil(3.5 - (4 * llAtan2(target.y - source.y, target.x - source.x) / PI));
   return llList2String(DIRS, index);

}

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Footnotes

function float llAtan2( float y, float x );