View source for LlAtan2

{{LSL_Function
|func_id=3|func_sleep=0.0|func_energy=10.0
|func=llAtan2|sort=Atan2
|func_footnote=Similar to the arctangent(y/x) except it utilizes the signs of x & y to determine the quadrant. Returns zero if x and y are zero.
|p1_type=float|p1_name=y|p1_desc
|p2_type=float|p2_name=x|p2_desc
|return_type=float
|return_text=that is the {{wikipedia|Atan2|arctangent2}} of y, x.
|spec
|caveats
|constants
|examples=<lsl>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));
  }
}</lsl><lsl>//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 :-)

string compass (vector target) 
{
    vector me = llGetPos();
    float distance = llVecDist(me, target);
    list DIRS =["W","NW","N","NE","E","SE","S","SW","W"];
    return llList2String(DIRS,llCeil(4.5-((4*llAtan2((target.y-me.y)/distance,(target.x-me.x)/distance))/PI)));
}</lsl>
|helpers
|also_functions=
{{LSL DefineRow|[[llSin]]|[[llAsin]]|sine & inverse Sine}}
{{LSL DefineRow|[[llCos]]|[[llAcos]]|cosine & inverse cosine}}
{{LSL DefineRow|[[llTan]]||tangent}}
|also_articles=
{{LSL DefineRow||{{wikipedia|Atan2}}|}}
{{LSL DefineRow||{{wikipedia|Inverse_trigonometric_function}}|}}
|notes
|cat1=Math/Trigonometry
|cat2
|cat3
|cat4
}}