ATN2/de

= (**COPIED FROM ENGLISH PAGE**) === 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 single variable that is assigned with the ATN2 of variable single.
X	The single variable with the distance in x-direction.
Y	The single 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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