ArcTan(x,y)?

[StephenG1CMZ]

(04-05-2017 03:39 PM)toml_12953 Wrote:  

(04-05-2017 03:00 PM)StephenG1CMZ Wrote:  However, unlike ATAN2, ARG will not always work

Code:

 ATAN2_UNUSEDYX(YY,XX) 
 BEGIN //MY ATAN2
  IF XX==0 AND YY==0 THEN
   RETURN 0; //CONVENIENT;
  END;
  //-π..π 
  RETURN ARG(XX+*YY);//BUILT-IN HANDLES MOST
// the heiroglyphic is imaginary i
 END;

I don't understand what the first test is for. ARG((0,0)) returns 0 even without it.

Tom L

Mathematically, (0,0) is undefined, although in the interests of having the code not break mid-flight, atan2 implementations normally return 0.

On the 8151 Android emulator, ARG fails for 0,0 rather than returning 0...
Glad to see this has improved.

By the way, I notice there is an error in the Help for ARG (in the new version too):

The Syntax is described as ARG(3+3i) but this gives a syntax error.
Actually (3+3*i) is required.