[proFit-list] Plugin Problems

[Dirk Fröhling]

Dear Kurt,

I was on vacation, too, so sorry for replying late as well. Your work- 
around works, I can now update the module.

Thank you for your support!

Dirk

Am 29.07.2009 um 06:17 schrieb pro Fit Support:

> Dear Dirk
>
> I have been away for holidays, so please apologize my belated reply.
>
> Anyway, the problem you are facing is due to an issue with pro Fit  
> 6.1. The function for which you are calling SetFunctionParam does  
> not have an x-value. In that case, pro Fit assumes that the first  
> input of the function is the "default" input, and SetFunctionParam  
> does, under some situations, not work properly when called to change  
> the value of the default input. For them moment, as a work-around,  
> add the statement "x := x;" to the beginning of your function, which  
> will trick pro Fit into believing that your function does have an x- 
> value.
>
> The issue will be fixed in the next release.
>
> Best regards
>
> Kurt Sutter
>
>
> On 9 Jul 2009, at 3:43, Dirk Fröhling wrote:
>
>> Dear Kurt,
>>
>> I tracked the problem down to a call of "SetFunctionParam".
>>
>> To use my ODE Module plugin, the user has to provide a function  
>> called "derivs" which calculates the derivatives of dependent  
>> variables at a given time. The function expects the time, the  
>> variable values and delivers the derivatives. Example declaration:
>>
>> function derivs(t, y1, y2, y3, y4, dydt1, dydt2, dydt3, dydt4:  
>> extended);
>>
>> From ODEModule, I call the function like
>>
>> 	SetFunctionParam(DefName, 1, x);
>> 	for (i = 1; i <= N; i++)
>> 		SetFunctionParam(DefName, i+1, y[i]);
>> 	for (i = 1; i <= N; i++)
>> 		SetFunctionParam(DefName, i+N+1, dydx[i]);
>>
>> 	t = CallFunction(DefName, 0);
>>
>> 	for (i = 1; i <= N; i++) {
>> 		dydx[i] = GetFunctionParam(DefName, i+N+1);
>> 	}
>>
>>
>> DefName is a Str255, i is short, x, y[i] and dydx[i] are double  
>> values. N is four in this example.
>>
>> Like I said, it works with pro Fit 6.0.6, but with 6.1.10 on Intel,  
>> it doesn't. And I get the "ODE Module: Bad parameter value for this  
>> function." message.
>>
>> If I comment out the SetFunctionParam() calls, it "works" in a way  
>> that it doesn't behave like I described below, e.g. plot all the  
>> curves in one window without title etc.
>>
>> Could this be a pro Fit problem with callback functions that use  
>> double/extended values?
>>
>> Best regards,
>>
>> Dirk
>>
>>
>
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