PCA function suddenly Stop working with error

Hi everyone,

I'm using PCA to reduce the dimensions of my data and it was working without any problems, then when I came the next day and ran the MATLAB the PCA started throwing errors. I tried the exact example from MATLAB documentation (including using the same data in the example) but same error. below is my code followed by the error:

load hald
coeff = pca(ingredients)

the error:

Error using pcaklm (line 73)

Unknown type specified

Error in pca (line 53)

[w,truefrac] = pcaklm(mfilename,varargin{:});

------------------------------------------------------------------------------------------------------

My MATLAB version is R2021b

My OS is Ubuntu LTS 20.04

Answer 1

[the cyclist]

The line

[w,truefrac] = pcaklm(mfilename,varargin{:});

is not in the MATLAB pca function. You have presumably started calling a different pca function.

Try calling

which pca -all

from the command line to see what functions are in your path.

An internet search on pcaklm suggests that you might inadvertently be calling the ECGdeli Toolbox version. Perhaps you installed that?

[Qudor Engineer]

Thanks for reply.

Yes I insttaled ECGKit one year ago and the pca was working properly then suddenly it stop working and when I run

which pca -all

the output is:

/home/Documents/MATLAB/ecg-kit-0.1.6/common/prtools/pca.m

/home/Documents/MATLAB/ecg-kit-0.1.6/common/prtools/@prdataset/pca.p % prdataset method

/home/Documents/MATLAB/ecg-kit-0.1.6/common/prtools/@prdataset/pca.m % prdataset method

/usr/local/MATLAB/R2021b/toolbox/stats/bigdata/@tall/pca.m % tall method

/usr/local/MATLAB/R2021b/toolbox/stats/gpu/@gpuArray/pca.m % gpuArray method

/usr/local/MATLAB/R2021b/toolbox/stats/stats/pca.m

[the cyclist]

I think the easiest solution for you is to use pathtool to move the Stats toolbox version of pca to be higher priority than the ECGdeli version.

[Qudor Engineer]

I added the path using pathtool and now it is working. thank you very very much.