Map and Table Calculation

ATAN( ) function

Returns the arc tangent, i.e. the inverse tangent (tan^-1), of a value.

Syntax

ATAN(Value)

Input

Value	is a value
Domain type:	any Value domain

Output

ATAN returns:	a real value in radians
Domain:	system domain Value
Value range:	[-p/2,p/2]

Notes:

For the function ATAN, the output values are in radians. To convert radians to degrees, use the angular function RADDEG.
When the input value is undefined, the output will also be undefined.

Tip:

When the definition symbol = is used, a dependent output map or dependent output column is created; when the assignment symbol := is used, the dependency link is immediately broken after the output map/column has been calculated.

Usable in

MapCalc, TabCalc, Simple calculators

Examples

Pocket line calculator examples:

? ATAN(0.3)

returns 0.291

MapCalc example:

OutMap = ATAN(InMap)

InMap

OutMap

2.0	1.0	0.5
0.2	0.3	-1.0
?	-0.4	-0.1

1.107	0.785	0.464
0.197	0.291	-0.785
?	-0.381	-0.100

OutMap2 = RADDEG(ATAN(InMap2))

InMap2

OutMap2

0.000	0.500	0.707
0.866	1.000	-1.000
-1.000	-0.707	?

90	60	45
30	0	180
270	315	?

TabCalc example:

OutCol1 = ATAN(InCol1)

OutCol2 = RADDEG(ATAN(InCol2))

InCol1	OutCol1	InCol2	OutCol2
2.0	1.107	0.000	0
1.0	0.785	0.500	30
0.5	0.464	0.707	45
0.2	0.197	0.866	60
0.3	0.291	1.000	90
-1.0	-0.785	????	180
?	?	-1.000	270
-0.4	-0.381	-0.707	315
-0.1	-0.100	?	?

ASIN	SIN	SINH
ACOS	COS	COSH
ATAN2	TAN	TANH