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			function mcdemo10
% This example shows how to use Principal components analysis to decompose 
% Motion Capture data into components that are orthogonal to each other.
%
% Let us extract the first four seconds from the structure dance2

load mcdemodata
d=mctrim(dance2,0,4);

pause %%%%%%%%%%% hit a key to continue %%%%%%%%%%%%%%%%%%%%%%%%%%

% and convert it into a joint representation

j=mcm2j(d, m2jpar);

pause %%%%%%%%%%% hit a key to continue %%%%%%%%%%%%%%%%%%%%%%%%%%

% Next, we calculate the first three principal component projections of the
% structure j

[pc,p]=mcpcaproj(j,1:3);

pause %%%%%%%%%%% hit a key to continue %%%%%%%%%%%%%%%%%%%%%%%%%%

% and plot the amount of variance contained in these principal components
bar(p.l(1:3))

pause %%%%%%%%%%% hit a key to continue %%%%%%%%%%%%%%%%%%%%%%%%%%

% We see that the first PC contains ca. 85% of the variance, while the 
% next two components contain only 9% and 2%.
% 
% The PC projections can be investigated, for instance, by creating 
% animations:
%
% Please choose the directory where you want the animtaion frames to be 
% stored:

path = uigetdir([], 'Choose a Directory')

olddir = cd; 
cd(path)

pause %%%%%%%%%%% hit a key to continue %%%%%%%%%%%%%%%%%%%%%%%%%%

mcanimate(pc(1), japar);

cd(olddir)

pause %%%%%%%%%%% hit a key to continue %%%%%%%%%%%%%%%%%%%%%%%%%%

% The animations show that the principal component distort the body segment 
% relations, in particular, the lengths of certain body segments vary. 
% Often better results can be obtained by performing the PCA on the 
% segment representation
s=mcj2s(j,j2spar); % convert to segment structure
[pcs,ps]=mcpcaproj(s,1:3); % perform PCA
for k=1:3 % convert PC projections back to joint structures
    pcj(k) = mcs2j(pcs(k), j2spar);
end

pause %%%%%%%%%%% hit a key to continue %%%%%%%%%%%%%%%%%%%%%%%%%%

% Next, let us plot the first three PC projections
plot(ps.c(1:3,:)'), legend('PC1','PC2','PC3')

pause %%%%%%%%%%% hit a key to continue %%%%%%%%%%%%%%%%%%%%%%%%%%

% The plot reveals that the first PC correspond to non-periodic motion, 
% while PCs 2 and 3 correspond to (almost) periodic motion. Animation of 
% pcj(k) shows that the first three PCs correspond to translation of the 
% body, periodic anti-phase movement of arms, and periodic rotation of 
% torso.

			
...
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01.97 kB
License.txt15.84 kB2013-02-12 03:05
01.97 kB
01.97 kB
._License.txt313.00 B2013-02-12 03:05
MCT_manual_v1.4.pdf1.92 MB2013-02-12 04:00
._MCT_manual_v1.4.pdf82.00 B2013-02-12 04:00
01.97 kB
.DS_Store15.00 kB2013-02-11 04:26
01.97 kB
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contents.m3.85 kB2013-02-12 03:20
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<Icon^M>0.00 B2008-03-04 19:13
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mc2frontal.m2.02 kB2011-10-18 09:23
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mcanimate.m1.33 kB2011-10-18 09:04
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mcbandpass.m3.49 kB2011-10-18 09:01
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mccenter.m804.00 B2011-10-17 11:55
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mcconcatenate.m2.70 kB2013-02-12 03:01
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mccreateconnmatrix.m1.89 kB2011-10-19 09:00
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mccut.m698.00 B2011-10-18 08:26
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mcdecompose.m1.58 kB2011-10-18 08:20
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mcdemo.m1.82 kB2011-10-14 09:29
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mcdemo1.m4.13 kB2012-04-12 05:37
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mcdemo10.m2.27 kB2013-01-29 07:56
._mcdemo10.m82.00 B2013-01-29 07:56
mcdemo11.m1.87 kB2012-04-12 08:04
._mcdemo11.m167.00 B2012-04-12 08:04
mcdemo2.m2.27 kB2008-05-21 00:26
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mcdemo3.m3.46 kB2013-02-11 13:20
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mcdemo4.m3.09 kB2008-05-27 15:53
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mcdemo5.m4.13 kB2013-01-29 07:45
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mcdemo6.m1.28 kB2008-05-21 00:20
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mcdemo7.m1.38 kB2008-05-21 00:20
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mcdemo9.m2.86 kB2013-01-29 07:56
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mcdemodata.mat1.27 MB2012-04-16 04:59
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mcm2j.m1.08 kB2011-10-17 12:28
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mcmakedemoparams.m2.39 kB2008-05-13 14:29
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01.97 kB
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01.97 kB
._.DS_Store193.00 B2012-04-12 09:26
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validfield.m464.00 B2007-04-30 11:04
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releasenotes_v1.4.txt5.74 kB2013-02-12 03:10
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