How to input train data and test data (features of images) using SVM calssifier

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Preeti Mistry 2014-6-26

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https://ww2.mathworks.cn/matlabcentral/answers/137750-how-to-input-train-data-and-test-data-features-of-images-using-svm-calssifier

评论： Sara Rabei 2020-8-30

This is the code that i have got for classification using SVM. Can any one tell me how should i input train data and test data in the code,...

% Classfication using SVM classifier.............

% 1. Load the sample data

load dataname

% 2. Create data, a two-column matrix containing sepal length and sepal width % measurements for 150 irises.

data = [meas(:,1), meas(:,2)];

% 3. From the species vector, create a new column vector, groups, to classify data % into two groups: data and non-data.

groups = ismember(dataset,'data');

% 4. Randomly select training and test sets.

[train, test] = crossvalind('holdOut',groups); cp = classperf(groups);

% 5. Train an SVM classifier using a linear kernel function and plot the grouped data.

svmStruct = svmtrain(data(train,:),groups(train),'showplot',true);

% 6. Add a title to the plot, using the KernelFunction field from the svmStruct % structure as the title.

title(sprintf('Kernel Function: %s',... func2str(svmStruct.KernelFunction)),... 'interpreter','none');

% 7. Use the svmclassify function to classify the test set.

classes = svmclassify(svmStruct,data(test,:),'showplot',true);

% 8. Evaluate the performance of the classifier.

classperf(cp,classes,test); cp.CorrectRate

% ans =

 % 0.9867
 % 9. Use a one-norm, hard margin support vector machine classifier by changing the 
% boxconstraint property.

figure svmStruct = svmtrain(data(train,:),groups(train),... 'showplot',true,'boxconstraint',1e6);

classes = svmclassify(svmStruct,data(test,:),'showplot',true);

% 10. Evaluate the performance of the classifier.

classperf(cp,classes,test); cp.CorrectRate

%ans =

% 0.9867

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Fadi Alsuhimat 2020-6-5

did you solve it?

sabiya fatima 2020-7-29

i am getting error in line 4:

Undefined function 'crossvalind' for input

arguments of type 'char'.

please help to solve it

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回答（1 个）

Haddouche Abdelouahab 2017-3-21

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/137750-how-to-input-train-data-and-test-data-features-of-images-using-svm-calssifier#answer_259735

I would like to help with my project represented in classification EEG using lda pca ica and svm

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Sara Rabei 2020-8-30

Can i have it too!?.. Thank you

Sara Rabei 2020-8-30

Sorry for duplicating my messages..

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