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I am trying to extract weights for R's ksvm package.

Usually I use the e1071 package and the weights can be computed by

 weights = t(svmmodel$coefs) %*% svmmodel$SV

However, when I look into the ksvm package, both the coefficients and alphas (support vectors) are lists of the same dimension. The alphas do not return vectors.

My question is, how should I access the support vectors including the zero values? Would I have to use SVindex to correspond the variables back to the original input?

Thanks.

agstudy
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Florie
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1 Answers1

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Use xmatrix in the ksvm model (https://www.rdocumentation.org/packages/kernlab/versions/0.9-29/topics/ksvm-class). The xmatrix slot of the ksvm model svmmodel can be accessed using svmmodel@xmatrix.

user70963
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