ALOG Function

Reference Guide > A Routines > ALOG Function

ALOG Function

Returns the natural logarithm of x.

enabled.

Usage

result = ALOG(x)

Input Parameters

x—The expression that is > 0 which is evaluated. This expression can be an array.

Returned Value

result—The natural logarithm of x.

Keywords

None.

Discussion

ALOG is defined as:

y = logex

Double-precision floating-point and complex values return a result with the same data type. All other data types are converted to single-precision floating-point and yield a floating-point result.

ALOG handles complex numbers in the following way:

Alog(x) ≡ Complex(loge(|x|, arctan(x)))

Examples

x = ALOG(10)

PRINT, x

; PV-WAVE prints: 2.30259

x = ALOG(1)

PRINT, x

; PV-WAVE prints: 0