ATAN

Description: Returns the arctangent, or inverse tangent, of a number. The arctangent is the angle whose tangent is Number. The returned angle is given in radians in the range -pi/2 to pi/2.

Syntax: ATAN(Number)

• Number is the tangent of the angle you want.

• When used in an event analysis flowchart, Number must evaluate to a numerical value. It can include:

• Numerical values

• Standard operands (+, -, *, /)

• Predefined mathematical functions (exp, log, sin, etc.)

• Event analysis internal functions

• Event analysis resources

• References to any ReliaSoft Workbooks

Example:

• ATAN(1) = 0.785398 [the arctangent of 1 in radians, pi/4]

• ATAN(1)*180/PI() = 45 [the arctangent of 1 in degrees]