Question

我只是提供一些令我头疼的MATLAB代码。

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

然后

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);

当我调用这样的代码时

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

我得到了

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

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

还有其他功能如此定义

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

问题是什么？我应该定义kernel_type吗？我对MATLAB没有太多的经验。

Answer 1

问题是，只有当kernel_type参数是字符串data_type，'vector'，'ts'，{{1}之一时，才会定义'new_w' }和'new_unw'。但是你传递的参数'img'与任何这些情况都不匹配，所以3未定义，因为没有赋值。

要解决此问题，请在kernel_type语句中添加switch分支：

otherwise

另一种方法是传递正确的参数：

    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;

Answer 2

我认为它可能有两个原因之一： 1）matlab中已经有一个名为kernel_type的函数 2）你没有定义kernel_type，你应该只输入kerneltype =“”;声明一个空字符串

未定义的函数或变量＆＃34; kernel_type＆＃34;

2 个答案: