Re: [TRNSYS-users] TRNSYS christmas riddle

[David BRADLEY <d.bradley@tess-inc.com>]

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@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

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@cofelyaxima-gdfsuez.com

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David BRADLEY
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