Doubts pertaining to tutorial 3

[Sheeba Davis]

Hello

I have two doubts.

1. Re: Tutorial 3 and question 4

What i have understood is that if the marker weight value is more in the weights tab then there is higher matching between experimental and model markers and vice versa. Is this correct?

2. Re: Tutorial 3 and question 6

What i have understood is that the right acromium has the maximum marker error. Is it correct? And for the question why? it gives a hint of weighted least squares problem. Am i supposed to calculate the error or how is it related to the question?

Thanks
Sheeba Davis

[Dimitar Stanev]

What i have understood is that if the marker weight value is more in the weights tab then there is higher matching between experimental and model markers and vice versa. Is this correct?

Yes inverse kinematics will try to track the markers with higher weights better. However, this does ensure that there will be a better matching between experimental and model positions, because there are more than one tracking goals that may be in conflict with one another.

What i have understood is that the right acromium has the maximum marker error. Is it correct? And for the question why? it gives a hint of weighted least squares problem. Am i supposed to calculate the error or how is it related to the question?

Yes the acromium marker has the largest maximum error. It has to do with the weight (0.5) assign for this marker.

[Sheeba Davis]

Thanks for the reply.

[Sheeba Davis]

Hello

Tutorial 3: Question 8

Till toe off it is a positive angle and after the toe off it is a negative angle. is this correct?


Tutorial 3: Question 9

maximum force magnitude for pelvis ty is 178.616 N and the subject weight is 712 N
therefore, maximum residual force would be 533.384 N which is 75% of body weight. is this correct?

Thanks
Sheeba Davis