error in parameter optimazation AnyBody 5.2

Main Forum
1

Hi,
I am using parameter optimization functionality, but not with the built examples (GaitLowerExtremity etc)
I can load and run the kinematics but when I am trying to run the kinematic optimization I get that error message:

[FONT=&quot]#### Macro command : Run_Kinematic_Optimization(2:3)> run[/FONT]
[FONT=&quot]2.0.0) Operation Sequence: (Operation: Main.JntParameterOptModel.OptimizeParameters.Analysis): [/FONT]
[FONT=&quot]2.0.0.0) Kinematics (Operation: Main.JntParameterOptModel.OptimizeParameters.KinematicStudyForParameterOptimization.Kinematics): [/FONT]
[FONT=&quot]2.0.0.0.0) PreOperation (Operation: Main.JntParameterOptModel.OptimizeParameters.KinematicStudyForParameterOptimization.Kinematics.PreOperation): [/FONT]
[FONT=&quot]2.0.0.0.0.0) InitialConditions (Operation: Main.JntParameterOptModel.OptimizeParameters.KinematicStudyForParameterOptimization.InitialConditions): [/FONT]
[FONT=&quot]2.0.0.0.0.0) …Design variables have been updated.[/FONT]
[FONT=&quot]2.0.0.0.0.1) …Load-time positions have been re-established.[/FONT]
[FONT=&quot]2.0.0.0.0.2) …Kinematic analysis completed. The kinematic constraints have been resolved.[/FONT]
[FONT=&quot]2.0.0.0.0.3) …Initial conditions are fully updated.[/FONT]
[FONT=&quot]2.0.0.0) Kinematic analysis…[/FONT]
[FONT=&quot]2.0.0.149) …Kinematic analysis completed[/FONT]
[FONT=&quot]2.0) Optimization (Operation: Main.JntParameterOptModel.OptimizeParameters.ParameterOptimization): [/FONT]
[FONT=&quot]2.0) Optimization step (Operation: Main.JntParameterOptModel.OptimizeParameters.ParameterOptimization): [/FONT]
[FONT=&quot]2.0) Evaluating KKT conditions (Operation: Main.JntParameterOptModel.OptimizeParameters.ParameterOptimization): [/FONT]
[FONT=&quot]ERROR(OBJ1) : C:/U…s/ith/D…s/G…b/L…g/K…l/ModelSetup.any : DynamicDataSet.Points.Markers.RMKnee.PosInterpol : Parameter has an invalid value for this interpolation; extrapolations are not allowed.[/FONT]

It has nothing to do with the tStart/tEnd values of the study. I have spoken with Michael Skipper Andersen‎ and he ensured me that it is a bug in AMS it self. I have been told that the bug is not present in the console application, but in AnyBody 5.2 I get the following error when loading a model with console.

[FONT=&quot]>load “Kinematics.main.any”[/FONT]
[FONT=&quot]Loading Main : “C:\Users\ith\Documents\GitHub\LowerExtremity-RBF-scaling\Subj[/FONT]
[FONT=&quot]ects\Ilias\ith_func_knee\Kinematics.main.any”[/FONT]
[FONT=&quot]Scanning…[/FONT]
[FONT=&quot]ERROR(SCR.SCN9) : System and load argument definitions (Virtual File)(8) :[/FONT]
[FONT=&quot]‘System and load argument definitions (Virtual File).2\anybodycon’ : Path does n[/FONT]
[FONT=&quot]ot exist.[/FONT]
[FONT=&quot]Model loading skipped[/FONT]

So there is really no work-around for me. Can you help me fix this problem.

Thanks,
Ilias

2

Hi Ilias,

Could you upload your model so we can replicate your error message. And please provide AMS and AMMR NR.

3

Hi Amir,

Thanks for your reply.
You can find my model here:

https://rapidshare.com/files/1292719846/LowerExtremity-RBF-scaling.rar
I am using AnyBody 5.2 with AMMR1.5.

Thanks in advance,
Ilias

4

Ilias,

sorry, I deleted the link with your link, because I was told that you may have a model that is not open for the public.

Problem 1 interpolation/extrapolation: Yes, this is not your fault, but I’m not sure if it is a AMS bug. I have seen this many times before, but if you change tEnd and tStart the model loads fine again:

I changed -1 into -10 and it worked
AnyIntVar LastFrame = Main.ModelSetup.DynamicDataSet.Header.LastFrameNo-10;
AnyIntVar FirstFrame = Main.ModelSetup.DynamicDataSet.Header.FirstFrameNo+1;

It looks like something is going wrong in the end of the model. I’m not convinced that this is a AMS problem, it might be something C3D related… But we will look into that.

Problem 2 Console: The model loads smooth on my machine, but one of the developers had seen something similar before and is looking into that now. It might be something simple, eg a " …
… " in the script of a path description is seen as a new line command. Development is aware and working on this issue.

5

One more comment:

do you use

AnyBody version : 5. 2. 0. 3070

???

6

Hi Amir,

thanks for your reply.
Yes I am using that version of AnyBody (5. 2. 0. 3070).

I did what you suggested,but I still get the same error message!!
So, I am looking forward to any new suggestions.

Regards,
Ilias

7

Hi Amir and Ilias

I have the same problems with the new version of AMS. The kinematics works fine, but I get an interpolation error when parameter-optimization starts.

No selection of the start/end times have solved my problem. However, I had no problems running the model in the console application. So that was my work-around.

Like Ilias’ case it doesn’t happen when I run the AMMR example models. However, I believe Ilias is still right, it looks like a bug in AMS, since it wasn’t a problem in the previous version, and since it still works with the console application.

Hope you solve the problem,
/Morten