Error using cross validation with plsregress

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bruno ebel
bruno ebel 2020-9-23
评论： bruno ebel 2020-9-29
Hi everyone,
I am running a PLS regression and try to perform cross validation (k-fold) with matlab data.
load spectra
X = NIR;
y = octane;
[XL,yl,XS,YS,beta,PCTVAR,MSE] = plsregress(X,y,10,'CV',10);
Unfortunately, this error appear:
Could you explain to me how to solve it please?
Thank you in advance for your help.
Bruno
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bruno ebel
bruno ebel 2020-9-24
Ok, i've changed the order of the folder in the set up. Thanks again :-)

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Adam Danz
Adam Danz 2020-9-24
编辑：Adam Danz 2020-9-28
Based on the results of
which crossval -all
a function with the same name from a 3rd party toolbox (pls toolbox) is shadowing Matlab's crossval function which is called by plsregress.
If you are not using the pls toolbox, remove it from your Matlab path using
rmpath('C:\Program Files\MATLAB\R2017a\toolbox\pls_toolbox_862')
% or
rmpath([matlabroot, '\toolbox\pls_toolbox_862'])
If you are using the pls toolbox, you can use Julian's answer explained here
https://www.mathworks.com/matlabcentral/answers/149059-how-do-i-invoke-a-shadowed-core-matlab-function-not-built-in-from-an-overloaded-function-of-same
It grabs the function handle from Matlab's crossval function and assigns it to a variable that you can use in addition to the crossval version in pls toolbox.
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