See
char *Asc_UnitValue(CONST struct Instance *i)
in tcltk/interface/UnitsProc.c.
The basic strategy with the tcl/tk interface is to include relation dim
checking as part of displaying the correct units on the residual. Any
relation which is token-based and does not yet have a dimensionality
derived [you cannot set the dimensionality explicitly on relations from the
language] has an attempt to derive the dimensionality any time it is
displayed (unless noisy checking is disabled). Since the answer the checker
obtains can change (until all the variables have fixed dimensions), it gets
called repeatedly while browsing until it succeeds or proves an error.
Most of the code involved is not heavily tied to tcl, so it would be easy
to call into it from python as desired.
On Sun, May 17, 2015 at 4:21 PM, John Pye <[email protected]> wrote:
> Hi Arash, Steffen,
>
> Indeed, I have noticed the same issue myself. I believe that this kind of
> term-by-term dimension checking was a feature of ASCEND in the Tcl/Tk GUI
> days, but somewhere along the way, the feature hasn't been correctly
> incorporated into the newer PyGTK GUI.
>
> Ben, I you familiar with where the dimensional checking of equations
> (declarative section) is done in ASCEND? Is there a function that needs to
> be run to conduct this checking, that perhaps is outside the 'system_build'
> step, and maybe still embedded in the Tcl/Tk interface code?
>
> There *is* dimension checking in the PyGTK GUI in relation to
> variable-setting, in assignment statements within METHODs, but I think that
> what you are referring to is missing and would be something that we can
> restore.
>
> Cheers
> JP
>
> On 18/05/15 07:27, Arash sadrieh wrote:
>
>
> Dear Steffen,
>
> Thanks for your email, I think John might know the answer?
>
> Cheers,
> Arash
>
>
> On 18 May 2015, at 6:44 am, Steffen Heldt <[email protected]>
> wrote:
>
> Dear Arash,
>
> I have a question regarding Ascends ability to check dimensional
> consistency. I use Ascend 0.9.9 on Ubutu 12.04 LTS. If I manipulated the
> equation "FlatEnds" in file "vessel.a4c" to make it dimensional
> inconsistent (e.g. end_area = 1 {PI} *D^*3*/4), then I expect an error or
> warning message when loading/compiling the model. However, I don't see any
> error/warning message in the PyGTK GUI although the solution of the model
> changes.
>
> Can you please let me know where the error/warning is suppose to be
> raised? Thank you very much in advance for your support!
>
> Best regards,
>
> Steffen
>
>
>
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