CODEWITHSUNDEEP
matlab
MPejic
MPejic

Reputation: 57

Undefined function or variable "kernel_type"

I am just giving part of the MATLAB code that gives me a headaches.

function [hm,sm] = SKSClab(filename,data_type,maxk,true_labels,plot_flag)

%Inputs:

% filename: .txt file (or .jpg for images) with the data (instances as rows, features as columns)
% data_type: 
% 1) net_unw = unweighted network (filename represents the adjacency list)
% 2) net_w = weighted network (filename represents the adjacency list)
% 3) vector = generic data points
% 4) ts = time-series
% 5) img = image
% maxk: maximum number of clusters to look for
% true_labels: labels if present 
% plot_flag: 1 -> plot results, 0-> do not plot anything

Then

switch data_type
       case 'vector'
       THR_dim = 100;
       if(size(X,2)<THR_dim)
           kernel_type = 'RBF_kernel'; 
       else
           kernel_type = 'cosine_kernel'; %use cosine kernel when enough features are present
       end
       case 'ts'
       kernel_type = 'corrrbf_kernel';
       case 'net_w'
       kernel_type = 'cosine_kernel';
       case 'net_unw'
       kernel_type = 'cosine_kernel';
       case 'img'
       kernel_type = 'chisquared_kernel';
end

%Tuning
tunestruct = {samplefunc,numreps,data_type,MS_criterion};
[Xtrain,optk,optsig2,tuningExtras] = tuneSKSC(data,kernel_type,maxk,tunestruct);

When I invoke code like this

SKSClab('proba',3,6,1)

I got

Loading data...
Undefined function or variable "kernel_type".

Error in SKSClab (line 179)
[Xtrain,optk,optsig2,tuningExtras] = tuneSKSC(data,kernel_type,maxk,tunestruct);

There is also other function defined like this

 function [Xtrain,optk,optsig2,extras] = tuneSKSC(datastruct,kernel,maxk,tunestruct)

What is the problem?Should I define kernel_type?I do not have too much experiance with MATLAB.

Upvotes: 0

Views: 163

Answers (2)

user2271770
user2271770

Reputation:

The problem is that kernel_type will be defined only if the data_type argument is one of the strings 'vector', 'ts', 'new_w', 'new_unw' and 'img'. But you pass the argument 3 that doesn't match any of these cases, so kernel_type goes undefined, because there is no assignation to it.

To fix this add to the switch statement an otherwise branch:

    switch data_type
    case 'vector'
            THR_dim = 100;
            if(size(X,2)<THR_dim)
                    kernel_type = 'RBF_kernel'; 
            else
                    kernel_type = 'cosine_kernel';
            end
    case 'ts'
            kernel_type = 'corrrbf_kernel';
    case 'net_w'
            kernel_type = 'cosine_kernel';
    case 'net_unw'
            kernel_type = 'cosine_kernel';
    case 'img'
            kernel_type = 'chisquared_kernel';
    otherwise
            kernel_type = 'some_default_kernel_that_makes_sense';
    end;

The alternative is to pass the correct arguments:

SKSClab('proba','vector',6,1)

Upvotes: 2

Michthan
Michthan

Reputation: 137

I think it can have one of two causes: 1) There is already a function in matlab that is named kernel_type 2) You didn't define kernel_type and you should just type kerneltype = ""; to declare an empty string

Upvotes: 0

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