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

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);

[madhan ravi]

can you upload the function and your .dat file

[Rui Mauaie]

I send the code and the function

[Rui Mauaie]

codes and functions I trying to send the data

[Rui Mauaie]

data

[Rui Mauaie]

hi did you receive the data and the function

[Stephen23]

@Rui Mauaie: please show the complete error message. That means all of the red text.

[Rui Mauaie]

Undefined function or variable 'constructKernel'.

Error in KPCA (line 68)

K = constructKernel(data,[],options);

Error in myfunction_kernel_pca_kde (line 25)

[EVC,LATENT] = KPCA(X,options);

[Stephen23]

@Rui Mauaie: read the error message:

Undefined function or variable 'constructKernel'.

It states quite clearly that constructKernel is undefined. Why do you think that constructKernel should exist and that MATLAB should be able to find it? Do you expect it to be a function or a variable? If so, where did you save/define it?

[Rui Mauaie]

this is the code

[EVC,LATENT] = KPCA(X,options);

Ktest = constructKernel(X,X,options);

TKtest = constructKernel(XT,X,options);

this is the function

if isfield(options,'Kernel') && options.Kernel

K = data;

else

K = constructKernel(data,[],options);

end

clear data;

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

[Rui Mauaie]

that is the code and function

[Stephen23]

"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