Why pca doesn't work on matlabR2013b?

Question

Michelle 2014-3-11

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评论： Anne 2014-7-11

I'm trying to run pca on a dataset that I have and I'm finding an error, then I tried:

TT=pca(randn(20,200));

It gives me the same following error message:

Undefined variable "classreg" or class "classreg.learning.internal.wnanmean".

Error in pca (line 297) mu = classreg.learning.internal.wnanmean(x, vWeights);

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Anne 2014-7-10

Michelle - Do you remember how you resolved this issue? I'm facing the same problem right now...

Thanks for any hints you may have!

Anne 2014-7-11

If anyone else has this problem in the future, I just got it resolved through tech support.

It seems like MATLAB might be looking in the wrong directories for the definition of "classreg". This error occurs during installation sometimes. Please execute the following at the command line:

>> restoredefaulthpath; >> rehash toolboxcache; >> savepath;

Then, try executing your code.

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Answer 1

Youssef Khmou 2014-3-11

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编辑：Youssef Khmou 2014-3-11

在 MATLAB Online 中打开

hi, i am not aware about the error, but technically this alternative multiscale pca needs some details , let us take the example you tried before, 20 signals each of length 200.

x=randn(200,20);
% additional parameters. 
level = 5;
wname = 'sym4'; %
npc = 'kais';
[x_sim, qual, npc] = wmspca(x,level,wname,npc); 
subplot(1,2,1); plot(x(:,1)); title(' original first signal')
subplot(1,2,2); plot(x_sim(:,1),'r'); title(' transformed first signal')

try to manipulate the parameters using Documentation

But that result damaged the correlation property of the random signals :

surf(cov(x))
figure; surf(cov(x_sim))

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Michelle 2014-3-11

Thanks for your help but I really need the regular PCA for a paper comparison.

Youssef Khmou 2014-3-11

在 MATLAB Online 中打开

try this function if you cant fix the error .

<http://crcv.ucf.edu/source/dimension%20reduction/pca.m>

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Answer 2

Ilya 2014-3-11

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I suggest that you get in touch with the tech support. (You can find their phone number and email at mathworks.com.) There may be an issue in your MATLAB installation.