MATLAB: Svmtrain

urgent

Hello all,

I have two sets of data each of size 3×400. I would like to train them using svmtrain but I don't know what I should put for group. Can you please help me? can you also let me know what should I put for group if I get data with arbitrary sizes? thanks.

Best Answer

Each data sample must belong to a pre-known group for the purpose of svmtrain. The grouping variable is a list of which group each sample belongs to.

Do you have 3 features or 400 features? Are your two data sets indicating exactly two different groups, or are there entries from multiple groups within a data set? If your data is already split by groups, then your group variable should be 1 for each member of the first data set and 2 for each member of the second data set.

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The group should be the class number assigned to each of those training images (based upon some kind of external judgement). It should not be a feature.

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Here's one way:

[~,groupIdx] = ismember(species,{'setosa','versicolor','virginica'})

A more general way to do this would be

[~,groupIdx] = ismember(species,unique(species))

Best Answer

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