Manual Page for Command >>>> LOG(F)


Syntax
>>>> LOG(F)

Parent Command
all third-level commands in block > PARAMETER

Subcommand
-

Description
The parameter to be estimated is a log-normally distributed factor with which the initial TOUGH2 parameter value is multiplied:

p = log10(X/X0) <=> X = X0 * 10p

Here, p is the estimated parameter, X is the TOUGH2 parameter, and X0 is the initial value of the TOUGH2 parameter. This option is useful to determine the mean of a log-normally distributed quantity while maintaining ratios (e.g., if estimating a common factor applied to all three permeability values in a model domain, the anisotropy ratio remains constant). Estimating a factor is chosen here over estimating the parameter value directly (command >>>> VALUE) or its logarithm (command >>>> LOGARITHM (p)).

Example
> PARAMETER
>> ABSOLUTE permeability
>>> MATERIAL: SAND1 SAND2 SAND3 SAND4 SAND5
>>>> estimate LOG(F)
>>>> INDEX : 1 2 3
>>>> initial GUESS: 0.0 (default)
>>>> RANGE : -3.0 3.0
<<<<
<<<
<<

See Also
>>>> LOGARITHM (p) | >>>> FACTOR (p) | >>>> VALUE


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Page updated: July 29, 1997