How can I solve this problem?

%数据集中1-59样本为第一类，60-130第二类，131-178第三类

load wine.mat;%载入数据

train_wine = [wine(1:30,:);wine(60:95,:);wine(131:153,:)];%第一类的1-30，第二类60-95，第三类131-153作为训练集

train_wine_labels = [wine_labels(1:30);wine_labels(60:95);wine_labels(131:153)];%提取标签

test_wine = [wine(31:59,:);wine(96:130,:);wine(154:178,:)];%剩下样本作为测试集

test_wine_labels = [wine_labels(31:59);wine_labels(96:130);wine_labels(154:178)];%提取相应标签

[mtrain,ntrain] = size(train_wine);

[mtest,ntest] = size(test_wine);%数据预处理，归一化

datatest = [train_wine;test_wine];

[dataset_scale,ps] = mapminmax(dataset',0,1);

dataset_scale = dataset_scale';

train_wine = dataset_scale(1:mtrain,:);

test_wine = dataset_scale((mtrain+1):(mtrain+mtest),:);

%预测模型

model = svmtrain(train_wine_labels,train_wine,'-c 2 -g 1');

[predict_label,accuracy] = svmpredict(test_wine_labels,test_wine,model);

函数或变量 'wine_labels' 无法识别。

Function or variable ‘wine_labels’ is not recognised.

[John D'Errico]

What problem?

[Fangjun Jiang]

Do you have variable "wine_labels" in the wine.mat file? Double check the variable name, or attach your wine.mat file

[卓亚]

Function or variable ‘wine_labels’ is not recognised.

Answer 1

[Shivani]

Hello @卓亚,

After looking at the code snippet and the MAT file you shared, I noticed that the 'wine.mat' file does not have a column called 'wine_labels'. It seems like you're extracting all the 13 columns of rows 1 to 30, 60 to 95 and 131 to 153 from 'wine' and storing it in 'train_wine'. However, you're facing an error when you try to run this line:

train_wine_labels = [wine_labels(1:30);wine_labels(60:95);wine_labels(131:153)];

This is because there is no variable/data in the workspace named 'wine_labels'. It is possible that you are missing out on loading another MAT file named 'wine_labels' which would ideally be a vector of dimension 178x1, containining the predictions corresponding to the input parameters in 'wine.mat'. Loading or creating the 'wine_labels' vector should resolve this error.

Hope this helps!

[卓亚]

Thanks for the reply, problem solved!

I have another query, when I get a raw data, how do I insert the labels into the data, do I add them manually through excel? Or is there a code for this in MATLAB