ATAN macro

The ATAN macro is available only in IBM® Campaign.

The numerical values to compute the arc tangent of. This can be a constant value, a column, a cell range, or an expression evaluating to any of the above. For the format definition of data, see the "Macro Function Parameters" section in the chapter in this guide for your IBM® product.

units_keyword

This optional keyword determines whether the input values and results are interpreted as degrees or radians. Select one of the following:

RADIAN - Performs the calculations in radians (default)

DEGREE - Performs the calculations in degrees

If this parameter is not specified, the default is radians. (To convert from radians to degrees, divide by PI and multiply by 180.)

For more details on using keywords in IBM® Campaign, see Format Specifications.

Description

ATAN calculates the arctangent of the values in the specified data range. The arctangent is the angle whose tangent is the contents of each cell. ATAN returns one new column for each input column, each containing the arctangent of numbers in the corresponding input column.

If the keyword RADIAN is used, ATAN returns values in the range -π/2 to π/2. If the keyword DEGREE is used, ATAN returns values in the range -90 to 90.

Examples

TEMP = ATAN(1) or TEMP = ATAN(1, 0) or TEMP = ATAN(1, RADIAN)

Creates a new column named TEMP containing the value 0.785 (

radians).

TEMP = ATAN(1, 1) or TEMP = ATAN(1, DEGREE)

Creates a new column named TEMP containing the value 45 (degrees).

TEMP = ATAN(V1)

Creates a new column named TEMP, where each value is the arctangent (in radians) of the contents of column V1.

TEMP = ATAN(V1:V3, 1)

Creates three new columns named TEMP, VX, and VY. The values in the TEMP column are the arctangents of the contents of column V1, the values of the VX column are the arctangents of the contents of column V2, and the values of the VY column are the arctangents of the contents of column V3. All values are in degrees.

TEMP = ATAN(V1[10:20])

Creates a new column named TEMP, where the first 11 cells contain the arctangents of the values in rows 10-20 of column V1 (in radians). The other cells in TEMP are empty.

TEMP = ATAN(V1[1:5]:V2)

Creates two new columns named TEMP and VX, each with values in rows 1-5 (the other cells are empty). The values in column TEMP are the arctangents of the corresponding rows of column V1, and the values in column VX are the arctangents of the corresponding rows of column V2. All values are in radians.

Related functions

Function	Description
ACOS	Computes the arccosine of the contents of the specified data range
ASIN	Computes the arcsine of the contents of the specified data range
ATAN	Computes the arctangent of the contents of the specified data range
TAN	Computes the tangent of the contents of the specified data range