/**
* Removes a variable from the parser. For example after calling addStandardConstants(),
* removeVariable("e") might be called to remove the euler constant from the set of variables.
*
* @return The value of the variable if it was added earlier. If the variable is not in the table
* of variables, <code>null</code> is returned.
*/
public Object removeVariable(String name) {
return symTab.remove(name);
}
