(j3.2006) Rationale for RANDOM_INIT?

[Malcolm Cohen]

>From a user's 
>prespective, she has no way of knowing whether a single
>seed was used to initialize the PRNG in each image or

 

Oh yes they do.


>*distinct* seeds were used. That's an implementation detail,



No, it is part of the API.

 

RANDOM_SEED(GET=) and (PUT=) have requirements.

 

>The only thing that the user cares about is what
>does RANDOM_NUMBER return after a call to RANDOM_INIT with
>IMAGE_DISTINCT=.true. (and whether the sequences satisfy the
>properties of a uniform distribution on [0,1)).

 

That is absolutely not the case.  The repeatability requirement is a quite common user requirement for RANDOM_NUMBER.  There is no reason this should suddenly cease to be available just because the user also wants different sequences on different images.

 

Cheers,

-- 

..............Malcolm Cohen, NAG Oxford/Tokyo.

 

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