Matrix Operations and Finding Joint Angles

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Eric 2011-4-24

I am trying to find the angle between a segment and global y-axis.

HAT = icrest-hip;
UnitY = [0 1 0]
for  i = 1:size(position,1)
      normHAT(i,:) = HAT(i,:)/norm(HAT(i,:));
end

I created Y = zeros(171,3) which is the size of normHAT I want to put UnitY into each frame, i.e. 171 total.

Then I want to write a loop to find the angle at each frame

for i = 1:size(postion)
HATthetaY = acos(dot(Y(i,:),HAT))/(dot(Y(i,:),normHAT));
end

bym 2011-4-24

perhaps some sample data for HAT would help

Jan 2011-4-26

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