Manual Page for Command >>>> GUESS


Syntax
>>>> GUESS: guess

Parent Command
all third-level commands in block > PARAMETER

Subcommand
-

Description
This command provides an initial guess of the parameter to be estimated. If neither this command nor command >> GUESS is used, the initial guess is taken from the TOUGH2 input file. The initial guess is the starting point for the minimization algorithm, to be distinguished from prior information (see command >>>> PRIOR). The initial guess can be overwritten by the second-level command >> GUESS. If command >>>> LOGARITHM is present, the initial guess is the logarithm of the parameter. Similarly, if command >>>> FACTOR is present, the initial guess should be a multiplication factor (default is 1.0).

Example
> PARAMETER
>> ABSOLUTE permeability
>>> ROCK types: CLAY1 CLAY2 CLAY3 BOUND
>>>> FACTOR
>>>> initial GUESS : 1.0
>>>> is not WEIGHTed : 0.0 (default)
<<<<
>>> ROCK type : SAND1
>>>> LOGARITHM
>>>> PRIOR information : -12.0
>>>> standard DEVIATION: 1.0 order of magnitude
<<<<
<<<

>> GUESS, i.e., starting point for optimization
2 -13.0
<<

See Also
>> GUESS | >>>> PRIOR | >>>> DEVIATION (p) | >>>> VARIATION


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Page updated: July 29, 1997