Retrieve the value of an attribute column.
getAttributeColumn(object, attr_name, warn_missing = c("attr", "column"))
| object | The object to extract the attribute value from. |
|---|---|
| attr_name | The name of the attribute to extract |
| warn_missing | Give a warning if the "attr"ibute or "column" is missing. Character vector with zero, one, or both of "attr" and "column". |
The value of the attribute (or NULL if the attribute
is not set or the column does not exist)