# LNDAX Function (Math and Trig)

Returns the natural logarithm of a number.

## Syntax

LN ( <Number> )
Parameter Attributes Description
Number

The positive number for which you want the natural logarithm.

## Return values

Scalar A single decimal value.

The natural logarithm of the number passed as an argument.

## Remarks

Returns the natural logarithm of a number.
Natural logarithms are based on the constant e (2.71828182845904).
LN is the inverse of the EXP function.
If the number is less than or equal to zero, the function generates an error.

» 3 related functions

## Examples

```--  Logarithmic functions include LOG10, LN, LOG, and EXP to compute
--  logarithms using various bases or exponential.
DEFINE
VAR Vals = GENERATESERIES ( 1, 25, 4 )
EVALUATE
Vals,
"LN",       LN      ( [Value] ),
"LOG10",    LOG10   ( [Value] ),
"LOG 5",    LOG     ( [Value], 5 ),
"EXP",      EXP     ( [Value] )
)

```
Value LN LOG10 LOG 5 EXP
1 0.00 0.00 0.00 2.72
5 1.61 0.70 1.00 148.41
9 2.20 0.95 1.37 8,103.08
13 2.56 1.11 1.59 442,413.39
17 2.83 1.23 1.76 24,154,952.75
21 3.04 1.32 1.89 1,318,815,734.48
25 3.22 1.40 2.00 72,004,899,337.39

## Related functions

Other related functions are:

Last update: Aug 3, 2024     » Show contributors

Contributors: Alberto Ferrari, Marco Russo, Kenneth Barber,

Microsoft documentation: https://docs.microsoft.com/en-us/dax/ln-function-dax

# Context Transition

This function performs a Context Transition if called in a Row Context. Click to read more.

# Row Context

This expression is executed in a Row Context. Click to read more.

# Not recommended

The use of this function is not recommended. See Remarks and Related functions for alternatives.

# Not recommended

The use of this parameter is not recommended.

# Deprecated

This function is deprecated. Jump to the Alternatives section to see the function to use.

# Volatile

A volatile function may return a different result every time you call it, even if you provide the same arguments. Click to read more.

# Deprecated

This parameter is deprecated and its use is not recommended.

# DirectQuery compatibility

Limitations are placed on DAX expressions allowed in measures and calculated columns.
The state below shows the DirectQuery compatibility of the DAX function.

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