Problem with initialization of mixed system

[Lennart Ochel]

Hi all, I have the following model that fails to compile (it generates
the c file but then gcc fails).
The problem is that a discrete variable is involved in a mixed
algebraic loop, appearing as an argument to the pre operator.
Then the initialization code tries to lookup the pre(pre(var))
variable and it fails.

Thanks
Fede

[Lennart Ochel]

error message:

buck.c: In function 'initializeStaticNLSData28':
buck.c:374: error: '$P$ATTRIBUTE$P$PRE$Pz_2' undeclared (first use in this function)
buck.c:374: error: (Each undeclared identifier is reported only once
buck.c:374: error: for each function it appears in.)

generated c-code:

368: void initializeStaticNLSData28(void *inData, void *inNlsData)
369: {
370:   DATA* data = (DATA*) inData;
371:   NONLINEAR_SYSTEM_DATA* nlsData = (NONLINEAR_SYSTEM_DATA*) inNlsData;
372:   int i=0;
373:   /* static nls data for $P$PRE$Pz_2 */
374:   nlsData->nominal[i] = $P$ATTRIBUTE$P$PRE$Pz_2.nominal;
375:   nlsData->min[i]     = $P$ATTRIBUTE$P$PRE$Pz_2.min;
376:   nlsData->max[i++]   = $P$ATTRIBUTE$P$PRE$Pz_2.max;
377:   /* static nls data for $Pidealdiode1__s */
378:   nlsData->nominal[i] = $P$ATTRIBUTE$Pidealdiode1__s.nominal;
379:   nlsData->min[i]     = $P$ATTRIBUTE$Pidealdiode1__s.min;
380:   nlsData->max[i++]   = $P$ATTRIBUTE$Pidealdiode1__s.max;
381:   /* static nls data for $Pidealclosingswitch1__s */
382:   nlsData->nominal[i] = $P$ATTRIBUTE$Pidealclosingswitch1__s.nominal;
383:   nlsData->min[i]     = $P$ATTRIBUTE$Pidealclosingswitch1__s.min;
384:   nlsData->max[i++]   = $P$ATTRIBUTE$Pidealclosingswitch1__s.max;
385: }

[Lennart Ochel]

Probably the smallest model that is causing the error:

model Unnamed
  Real a;
initial equation 
  pre(a)^2 = 9;
equation 
  der(a) = 0;
end Unnamed;

Error message:

Unnamed.c: In function 'initializeStaticNLSData3':
Unnamed.c:134: error: '$P$ATTRIBUTE$P$PRE$Pa' undeclared (first use in this function)
Unnamed.c:134: error: (Each undeclared identifier is reported only once
Unnamed.c:134: error: for each function it appears in.)
OMDev\tools\MinGW\bin\mingw32-make: *** [Unnamed.o] Error 1

This can be easily fixed by introducing #define $P$ATTRIBUTE$P$PRE$Pa $P$ATTRIBUTE$Pa for all states (or continuous-time variables?).

If we do so, another error occurs:

Unnamed.o:Unnamed.c:(.text+0x1552): undefined reference to `_$P$PRE$Pa'

The current NLS implementation requires old values for each variable to inter-/extrapolate for some reasons.

[Lennart Ochel]

The errors above are fixed for now (r16895). Now we run into the same issue that is already mentioned in #2310.

[Martin Sjölund]

Postponed until 1.9.1

[Martin Sjölund]

This ticket was not closed for 1.9.1, which has now been released. It was batch modified for milestone 1.9.2 (but maybe an empty milestone was more appropriate; feel free to change it).

[Martin Sjölund]

Milestone changed to 1.9.3 since 1.9.2 was released.

[Martin Sjölund]

Moved to new milestone 1.9.4

[Lennart Ochel]

Replying to lochel:

The errors above are fixed for now (r16895). Now we run into the same issue that is already mentioned in #2310.

This is fixed for a long time. Probably this ticket should be tagged to milestone 1.9.0, however that cannot be selected anymore.