pub fn label_pre(&mut self, s: &str) -> &mut Self {
        self.label_formatter(
            &format!("function(v,a) {{ return {:?} + {}; }}",s,TICK_FORMAT)
        )
    }
/// prepend a string to the default label
prepend a string to the default label
prepend a string to the default label
pub fn label_pre(&mut self, s: &str) -> &mut Self {
        self.label_formatter(
            &format!("function(v,a) {{ return {:?} + {}; }}",s,TICK_FORMAT)
        )
    }
pub fn label_pre ( & mut self , s : & str ) -> & mut Self { self . label_formatter ( & format ! ( " " s TICK_FORMAT ) ) }
prepend a string to the default label
prepend a string to the default label
&mut self
s
&str
&mut self
s
&str