Returning a record from a function call doesn't work if the record
includes adjustable arrays. I'm not sure that's even allowed in a
record. This approach fails in both Dymola and OpenModelica. I'm back
to square 1...
record outRec2
parameter Integer n(fixed = false);
Real y[n](each fixed = false);
Real z(fixed = false);
end outRec2;
function fun3
parameter input Integer n(fixed = false);
input Real x;
output outRec2 out(n = n);
algorithm
out.y:=fill(x ^ 2, n);
out.z:=x ^ 3;
end fun3;
model m7
parameter Real a = 3;
parameter outRec2 p = fun3(2, a);
end m7;
On Thu, Feb 9, 2012 at 2:40 PM, Tom Short <[email protected]> wrote:
> Adrian, that wouldn't work in my more detailed model. This formulation
> might (this simple case works):
>
> model m5
> parameter Real a = 3;
> parameter outRec p=fun2(a);
> end m5;
>
> On Thu, Feb 9, 2012 at 2:22 PM, Adrian Pop <[email protected]> wrote:
>>
>> Hi,
>>
>> You could try as a workaround:
>> initial equation
>> p = outRec(a^2, a^3);
>>
>> Cheers,
>> Adrian Pop/
>>
>>
>> On 2012-02-09 19:46, Tom Short wrote:
>>>
>>> Thanks, Lennart. My initialization involves a few variables in nested
>>> for loops, so a function call or an algorithm makes the most sense. I
>>> also tried packaging up return values in a record, but my attempt at
>>> that also failed in OpenModelica (it worked in Dymola).
>>>
>>> package testInitialAlgorithm
>>> record outRec
>>> Real y(fixed = false);
>>> Real z(fixed = false);
>>> end outRec;
>>>
>>> function fun2
>>> input Real x;
>>> output outRec out;
>>> algorithm
>>> out.y := x^2;
>>> out.z := x^3;
>>> end fun2;
>>>
>>> model m5
>>> parameter Real a = 3;
>>> parameter outRec p;
>>> initial equation
>>> p = fun2(a);
>>> end m5;
>>>
>>> end testInitialAlgorithm;
>>>
>>>
>>> On Thu, Feb 9, 2012 at 12:02 PM, Lennart Ochel
>>> <[email protected]> wrote:
>>>>
>>>> Hello,
>>>>
>>>> currently we do not support initial algorithms at all.
>>>>
>>>> As an workaround you can try to convert your initial
>>>> algorithm into an initial equation. This will help for
>>>> testInitialAlgorithm.m1 and testInitialAlgorithm.m2.
>>>>
>>>> Tomorrow I will take a closer look on how to provide
>>>> initial algorithms and functions with multiple return-values.
>>>>
>>>> Best regards,
>>>> Lennart Ochel
>>>>
>>>>
>>>>
>>>> -----Ursprüngliche Nachricht----- From: Tom
>>>> Short<[email protected]>
>>>> Reply-to: [email protected]
>>>> To: [email protected]
>>>> Subject: Initialization issues during simulation
>>>> Date: Thu, 09 Feb 2012 09:45:03 -0500
>>>>
>>>>
>>>> Hello,
>>>>
>>>> I'm working on a package where I would eventually like to support both
>>>> Dymola and OpenModelica. One part relies on quite a bit of
>>>> pre-processing to initialize several parameters before models are
>>>> simulated. I haven't found a good way to do this in OpenModelica. The
>>>> following example shows several ways I've tried to initialize
>>>> parameters. The first two (m1 and m2) simulate, but the parameters are
>>>> not initialized properly. The second two (m3 and m4) fail when
>>>> generating code. Does anyone see errors in my code or know of
>>>> workarounds for this? All models seem to flatten properly and pass
>>>> check (except for m4).
>>>>
>>>> package testInitialAlgorithm
>>>> model m1
>>>> parameter Real a = 3;
>>>> parameter Real b(fixed = false);
>>>> initial algorithm
>>>> b:=a ^ 2;
>>>> end m1;
>>>>
>>>> model m2
>>>> m1 m(a = 4);
>>>> Real c;
>>>> equation
>>>> c = m.b + 1.0;
>>>> end m2;
>>>>
>>>> function fun
>>>> input Real x;
>>>> output Real y;
>>>> output Real z;
>>>> algorithm
>>>> y:=x ^ 2;
>>>> z:=x ^ 3;
>>>> end fun;
>>>>
>>>> model m3
>>>> parameter Real a = 3;
>>>> parameter Real b(fixed = false);
>>>> parameter Real c(fixed = false);
>>>> initial equation
>>>> (b,c) = fun(a);
>>>> end m3;
>>>>
>>>> model m4
>>>> parameter Real a = 3;
>>>> parameter Real b(fixed = false);
>>>> parameter Real c(fixed = false);
>>>> initial algorithm
>>>> (b,c):=fun(a);
>>>> end m4;
>>>> end testInitialAlgorithm;
>>>>
>>>> The model m3 fails with the following error:
>>>>
>>>> CodegenC.tpl: Template error: Unknown expression: (b,c)
>>>>
>>>> The model m4 fails with the following error:
>>>>
>>>> Tuple assignment only allowed when rhs is function call (in
>>>> testInitialAlgorithm.fun(a))
>>>>
>>>> I tested this on r11033 on 64-bit win7 and r11047 on ubuntu.
>>>>
>>>> - Tom
>>>>
>>>>
>>>
>>
