[TRNSYS-users] using storage c++ type

[Wouter Lumen]

Dear Knut,

Thank you for trying out my code!!!
The fact that it worked on your pc made it clear to me that the fault
was somewhere in the headerfile.

I have compared the headerfile i was using to another one and found out
that in mine, one of the storagefunctions was declared as a "double" instead
of a "void" as it should be.
When i changed that it worked.

Thanks again!!!

Kind Regards,
Wouter Lumen

ps: it should be stored[0]+=1 indeed (i'm pretty much a C++ newbie)



Citeren knut.erik.enerstvedt at niva.no:

>
> Wouter,
>
> I have compiled and tried your C++ component, and it runs without any
> "invalid floating point error" on my machine. I use the Microsoft Visual
> C++ 2008 Express Edition compiler.
>
> The Type doesn't quite work as you have explained, however. Instead of
> adding 1 to the two stored variables for every timestep, it simply sets
> them equal to 1 at each timestep. To add 1, write stored[0]+=1 instead of
> stored[0]=+1.
>
> I can not see any further errors in your code. By the way, do you know for
> sure that you have declared the storage functions correctly in the
> "TRNSYS.h" file? I don't think the pointer construction of "nitems" should
> be a problem, as it works for me when I use &nitems directly as function
> argument.
>
> I hope this was helpful in some way...
>
> Kind regards
> Knut Erik Enerstvedt
>
>
>
>
>
>
>
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> ----- Message from Wouter Lumen <wouter.lumen at ugent.be> on Sat, 19 Apr 2008
> 19:50:13 +0200 -----
>
>            To: trnsys-users at engr.wisc.edu
>
>       Subject: [TRNSYS-users] using storage c++ type
>
>
> Dear trnsys users,
>
> I'm having some troubles with using storage in my new c++ component.
> Every time i run the component i get a "invalid floating point error".
>
> I've have read about the possible causes of this error and i have narrowed
> it down to a problem with storage.
>
> I have attached a very simple sourcecode:
> It reads in 2 numbers (getal1 and getal2) and puts them back out after
> adding
> a constant to them (in this case, double a and double b).
>
> When i run this component and use hard coded values, such as 1 and 2
> for a and b, the
> component works flawless.
>
> But when i use storage (as in the attached file), i get the error.
> The storage is used in the following way:
> Every timestep "1" is added to the stored variables.
> So basically, now I add a larger, with timestep increasing, value to getal1
> and getal2.
>
> I have tried severall configurations when using the storage such as:
> not using the info[12]>0 manipulations,
> not using the setstorage at the end of the calculations,
> using them both, etc etc...
> Maybe the problem is in this, may be not...
>
> Another possible cause (which i think is more likely), is that it has
> something
> to do with the pointerconstruction for "nitems":
> int nitems=2;
> int* pitems=&nitems;
> double stored[2]={0,0};
> so that pitems points to nitems.
> This is done because the storage functions take an int* as argument
> and not an int.
>
> If anybody has any suggestions on what the problem could be, or could
> modify
> the sourcefile in a way that it should work. Please let me know.
>
> Thank you very much.
>
> Kind regards,
>
> Wouter Lumen.
>
>
>
>
>
>
>
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