[TRNSYS-users] TRNSYS christmas riddle

[David BRADLEY]

Marcello,
   TRNSYS should be giving you an error saying that the syntax of the 
equation is incorrect in all of those cases. The correct syntax of the 
MAX function is:

result = MAX(x,y)

   Thanks for catching that the syntax checking is not sufficient. I 
will ask the elves to put it on the bug list.
Best,
  Santa Claus


On 12/23/2014 08:55, marcello.caciolo at cofelyaxima-gdfsuez.com wrote:
>
> Dear TRNSYS users,
>
> Christmas approaches, and we found an amazing issue concerning TRNSYS 
> equations that we would like to share with you.
>
> A day, we created a new equation in TRNSYS, taping (by error) the 
> following expression :
>
> new = max(12),7
>
> you could think that TRNSYS reports an error…but you are wrong : the 
> result was 12 (try to plot it !)
>
> We was just thinking that TRNSYS is so smart that it corrects our 
> error, when we had a doubt. We tried to change the expression in :
>
> new = (max(12),7)
>
> and in this case, TRNSYS crashed giving us a horrible statement : 
> “forrtl : severe (408): fort: (3) : Subscript #1 of the array STACK 
> has value 0 which is less than the lower bound of 1”…
>
> But variety is the spice of live, than we tried another expression 
> again :
>
> new = 0*(max(12),7)
>
> You can imagine how we were surprised when TRNSYS plotted a constant 
> value of…84 !!!
>
> Definitely, we decided to write a letter to Santa Claus to help us to 
> solve this riddle…
>
> Merry Christmas to the TRNSYS group!
>
> *Marcello Caciolo*
> Responsable Outils et Méthodes d'Analyse Energétique
>
> cid:image003.jpg at 01CD4E08.954D04D0
> *
> *Cellule Efficacité Energétique et Environnementale - Pôle Projets et 
> Réalisations
> 46 Boulevard de la Prairie au Duc
> BP 40119 - 44201 Nantes Cedex 02
> Tél.: +33 02 40 41 06 57
> marcello.caciolo at cofelyaxima-gdfsuez.com 
> <mailto:prenom.nom at aximaseitha-gdfsuez.com>
>
> P*Pensez à l'environnement avant d'imprimer ce message*
>
>
>
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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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