This function quickly detectes which columns have the same value for each observation
zerovar(df)Dataframe
Other Tools: autoline,
bindfiles, bring_api,
db_download, db_upload,
export_plot, export_results,
get_credentials,
get_currency,
h2o_predict_API,
h2o_predict_MOJO,
h2o_predict_binary,
h2o_predict_model,
h2o_selectmodel, h2o_update,
haveInternet, importxlsx,
ip_country, iter_seeds,
json2vector, listfiles,
mailSend, matrixwd,
msplit, myip,
pass, quiet,
read.file, statusbar,
try_require, updateLares