# ATN()

Compatible with:
DOS Maximite CMM MM150 MM170 MM+ MMX Picromite ArmiteL4 Armite F4 ArmiteH7 Picomite CMM2

Syntax:
ATN( number )

Description:
Returns the arctangent of the argument 'number' in radians.

y = RAD(45) ' convert degrees to radians
x = TAN(y)
r = ATN(x)
z = DEG(r)
PRINT "y= ";y
PRINT "x= ";x
PRINT "r= ";r
PRINT "z= ";z
y = RAD(210) ' convert degrees to radians
x = TAN(y)
r = ATN(x)
z = DEG(r)
PRINT
PRINT "y= ";y
PRINT "x= ";x
PRINT "r= ";r
PRINT "z= ";z
output:
y= 0.7853981634
x= 1
r= 0.7853981634
z= 45
y= 3.665191429
x= 0.5773502692
r= 0.5235987756
z= 30
Use ATAN2 if you need to differentiate between all quadrants

Last edited: 29 September, 2020