Re: [TRNSYS-users] Reading data from an external file in a new TY PE

["keilholz, werner" <werner.keilholz@cstb.fr>]

Hi Jordi, 

If you use TRNSYS' external file mechanism, the file will actually be opened
by the TRNSYS main program (i.e. you don't need to open it, and thus your
program even doesn't need to know the file name). 

You just use the logical file number (LUN) to read from or write to that
file.

You can see how it works in 
.\Trnsys16\SourceCode\Types\Type9.for

It just says 
READ(LU_DATA,*,ERR=2000,END=2000)
without ever opening that file - it has been opened by TRNSYS by the time
this code is executed. 

The magical variable LU_DATA is just one of the parameters - the one that
has been linked to the assign statement in the PROFORMA (that's the reason
for the "Parameter" popup in the "Files" section of the Proforma). 
In type 9 it is a complicated formula depending on the number of parameters,
but basically it is just 
LU_DATA = PAR(N)

(N is the parameter holding the LUN).

Happy data shuffling!

Werner

 

> -----Message d'origine-----
> De : jordi cipriano [mailto:cipriano@cimne.upc.edu]
> Envoyé : lundi 25 juin 2007 08:02
> À : trnsys-users@engr.wisc.edu
> Objet : [TRNSYS-users] Reading data from an external file in a new TYPE
> 
> Dear all,
> 
> I'm programming a new TYPE and I would like to read some inputs from an
> external file. If I define a Logical Unit for this file and I put in the
> proforma of the Type the path of this file, how do I use the OPEN
> instruction
> within my TYPE ?. I have some doubts, because, as I understand, the fact
> of
> putting an external file in the proforma conducts to an ASSIGN instruction
> in
> the deck file. Thus, do I need to re-write again the path of the file in
> my
> fortran code, or is there any way to avoid that?.
> 
> Many thanks,
> 
> Jordi Cipriano
> BEE-Group
> CIMNE, Spain
> 
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