hi I'm using a code along with its function but when I run the code I got error related to the function may someone help me

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Rui Mauaie 2018-11-20

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https://ww2.mathworks.cn/matlabcentral/answers/430892-hi-i-m-using-a-code-along-with-its-function-but-when-i-run-the-code-i-got-error-related-to-the-funct

关闭： MATLAB Answer Bot 2021-8-20

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from my code

[EVC,LATENT] = KPCA(X,options);
Ktest = constructKernel(X,X,options);
TKtest = constructKernel(XT,X,options);
from the function
if isfield(options,'Kernel') && options.Kernel
    K = data;
else
    K = constructKernel(data,[],options);
end
clear data;

but when I run the code I got this

Error in KPCA (line 68)
    K = constructKernel(X,options);
Error in myfunction_kernel_pca_kde (line 25)
[EVC,LATENT] = KPCA(X,options);

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Rui Mauaie 2018-11-20

that is the code and function

Stephen23 2018-11-20

编辑：Stephen23 2018-11-20

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"so the constructKernel is a part of the function which has relation with my code "

But you did not define constructKernel anywhere in your code. If you do not define it, it does not exist. If it does not exist, you cannot use it. Trying to use it will throw an error.

Here I define a variable X:

X = 3;

Now I can use it:

sin(X)

If I do not define a variable before I use it, this will throw an error:

sin(Y) % do you expect this to work, even though Y is not defined?

If you expect constructKernel to be a function, then where is this function defined? I suspect that you might need to download it, e.g. from FEX:

https://www.mathworks.com/matlabcentral/fileexchange/?term=constructKernel

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