ATN2
(Created page with "= <span class="f_Header">Action</span> = ATN2 is a four-quadrant arc-tangent. While the ATN-function returns from -p/2 (-90°) to p/2 (90°), the ATN2 function returns the w...") |
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| − | A | + | A floating point variable that is assigned with the ATN2 of variable single. |
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| − | The | + | The float variable with the distance in x-direction. |
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| − | The | + | The float variable with the distance in y-direction |
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Latest revision as of 19:37, 15 June 2015
Contents |
Action
ATN2 is a four-quadrant arc-tangent.
While the ATN-function returns from -p/2 (-90°) to p/2 (90°), the ATN2 function returns the whole range of a circle from -p (-180°) to +p (180°). The result depends on the ratio of Y/X and the signs of X and Y.
Syntax
var = ATN2( y, x )
Remarks
|
Var |
A floating point variable that is assigned with the ATN2 of variable single. |
|
X |
The float variable with the distance in x-direction. |
|
Y |
The float variable with the distance in y-direction |
|
Quadrant |
Sign Y |
Sign X |
ATN2 |
|
I |
+ |
+ |
0 to p/2 |
|
II |
+ |
- |
p/2 to p |
|
III |
- |
- |
-p/2 to -p |
|
IV |
- |
+ |
0 to –p/2 |
If you go with the ratio Y/X into ATN you will get same result for X greater zero (right side in coordinate system) as with ATN2. ATN2 uses X and Y and can give information of the angle of the point over 360° in the coordinates system.
All trig functions work with radians. Use deg2rad and rad2deg to convert between radians and angles.
See Also
RAD2DEG , DEG2RAD , COS , SIN , TAN , ATN
Example
$regfile = "m48def.dat" ' specify the used micro $crystal = 8000000 ' used crystal frequency $baud = 19200 ' use baud rate $hwstack = 32 ' default use 32 for the hardware stack $swstack = 10 ' default use 10 for the SW stack $framesize = 40 ' default use 40 for the frame space Config Com1 = Dummy , Synchrone = 0 , Parity = None , Stopbits = 1 , Databits = 8 , Clockpol = 0 Dim S As Single , X As Single X = 0.5 : S = 1.1 S = Atn2(s , X) Print S ' prints 1.144164676 End
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