Error: not compatible with requested type trying to write svmlight

[dkincaid]

Trying to write a sparse matrix that was created using the text2vec package and getting an error about a type problem.

> write.svmlight(dtm_train, rownames(dtm_train), "/tmp/pd.svm")
Error in write.svmlight(dtm_train, rownames(dtm_train), "/tmp/pd.svm") : 
  not compatible with requested type
> class(dtm_train)
[1] "dgCMatrix"
attr(,"package")
[1] "Matrix"

[dselivanov]

Second argument should be numeric vector of target variable.