This function converts data from a tbl_df() format into a xts format.
Note that the dataframe must be a data.frame or tbl_df, and either the first column must be a valid date column, or there must be one column named date, Date or DATE to order by.
tbl_xts also allows the user to specify the columns to be transformed to xts, as well as an option for spreading by a single character or factor type column. See the example for details.
Specify the columns to be converted to xts format. If not provided, it will by default transform all numeric columns to xts.
spread_by
A character or factor type column used to create xts series by. See example.
spread_name_pos
Add the column name of the column used to spread_by as a Suffix, Prefix or None. Defaults to Suffix (puts spread_by name at end of colname, separated by an underscore).
Value
A xts dataframe, with columns xts series ordered by the first (date) column.