Create Pivot Table Easily
Remove all NA rows
Remove all NA cols
Add sub index within group
Helper for na_col_omit()
Detect if df has col
replace NA character into ""
Pivot easily by specifying rows, columns, values and split.
Replace a col with a data.frame.
Split by force with "" when split is NULL
Validate col
Pivot easily by specifying rows, columns, values and split.