ATAN()

All functions > MATH > ATAN()

Returns the arctangent (inverse tangent) of a number, in radians.

Signatures

Arctangent

Returns: Angle in radians, in (-π/2, π/2)

ATAN(number: T) → DOUBLE

With:

• T : Floating-point type (FLOAT, DOUBLE)

Signature notes:

• Accepts any real number
• ATAN(0.0) = 0, ATAN(1.0) = π/4, ATAN(-1.0) = -π/4
• As the input approaches ±∞, the result approaches ±π/2
• Returns NULL if the input is NULL

Examples

SELECT
    f1 := ATAN(0.0E0), -- atan(0) = 0
    f2 := ATAN(1.0E0), -- atan(1) = π/4
    f3 := ATAN(-1.0E0), -- atan(-1) = -π/4
    f4 := ATAN(1.732050808E0) -- atan(√3) = π/3
;