log Scale (GPL)

Syntax

log(dim(<numeric>), <function>)

or 

log(aesthetic(aesthetic.<aesthetic type>), <function>)

<numeric>. A numeric value indicating the dimension to which the scale applies. See the topic dim Function (GPL) for more information.

<function>. One or more valid functions. These are optional.

<aesthetic type>. An aesthetic type indicating the aesthetic to which the scale applies. This is an aesthetic created as the result of an aesthetic function (such as size) in the ELEMENT statement.

Description

Creates a logarithmic-transformed scale. The formula for the transformation is log<base>(x), where <base> is defined by the base function. If a base is not explicitly specified, the default is base 10. Data values for this scale must be greater than 0.

Example

Figure 1. Example: Specifying the scale and a base
SCALE: log(dim(2), base(2))