Re: simple question

[Martin Tomasek <tomasek () ufe cz>]

Tomas L. Byrnes napsal(a):
> Yes, and it you look at the real to integer, and integer to real, 
> assignments without conversion functions, you can see where the actual 
> assignment may be indeterminate. I don't have the datasets, and 
> haven't done Fortran since F77, but when I did Fortran, assignment 
> without type conversion produced unpredictable results. Specifically, 
> in little endian machines, assigning a real to an integer was a very 
> workable random number generator.

I learned fortran a few years ago, because I needed to test something on 
an astronomical library. I used g77 and never met this issue.

HARRY's docs mention following compilers:
compaq f90, portland group pgf90, g77, gfortran.

And BTW it's depressing to read READMEs. That guy suffered when he tried 
to work with old fortran code and datasets.. He had to reverse-engineer 
undocumented binary formats, handle nearly-duplicate entries, found out 
that someone fixed documented error in the data - but kept same 
timestamp on the file. He had to handle weird scaling of coordinates, 
obscure measurement units etc.. Search for 'cries' and for '% x10'.

>  
>
>  
>
> *From:* Martin Tomasek [mailto:tomasek () ufe cz]
> *Sent:* Saturday, December 05, 2009 4:04 PM
> *To:* Tomas L. Byrnes
> *Cc:* Drsolly; funsec; RandallM
> *Subject:* Re: [funsec] simple question
>
>  
>
> Tomas L. Byrnes napsal(a):
>
> Hence we return you to my focus: the code. Code does not lie, it 
> merely does what it was told.
>
>  
>
> By my reading, the CRU code produces ever more excited random numbers. 
> Someone else please read it and prove me wrong.
>
>
> Quote from docs: "Had to make some changes to allow for the
> move back to alphas (different field length from the 'wc -l' command)."
>
> If their code depends on calling external programs, it will be 
> difficult to verify. Unless you are sure of actual output formats. :-)
>
> --
> Martin Tomasek

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