Extracting coefficient variable names from glmnet into a data.frame

Question

I would like to extract the glmnet generated model coefficients and create a SQL query from them. The function coef(cv.glmnet.fit) yields a \'dgCMa

Answer 1

# requires tibble.
tidy_coef <- function(x){
    coef(x) %>%
    matrix %>%   # Coerce from sparse matrix to regular matrix.
    data.frame %>%  # Then dataframes.
    rownames_to_column %>%  # Add rownames as explicit variables.
    setNames(c("term","estimate"))
}

Without tibble:

tidy_coef2 <- function(x){
    x <- coef(x)
    data.frame(term=rownames(x),
               estimate=matrix(x)[,1],
               stringsAsFactors = FALSE)
}