How do I create a new dataframe column by dividing individual elements in two dataframe columns?

[bkamins]

@a.frist

@transform!(pij_df, :PROB_I_J = :JOINT_PROB_SUM / :DOC_COUNT_SUM)

do

@rtransform!(pij_df, :PROB_I_J = :JOINT_PROB_SUM / :DOC_COUNT_SUM)

or

@transform!(pij_df, :PROB_I_J = :JOINT_PROB_SUM ./ :DOC_COUNT_SUM)