Function boxplot_add 

pub fn boxplot_add<V>(
    plot: &mut Plot<BoxplotGraphics>,
    label: &str,
    data: &[V],
) -> Result<(), BoxplotError>
where
    V: ToString,

Appends a series to an existing boxplot.

Errors

Returns BoxplotError::EmptyAppend when data is empty and BoxplotError::InvalidNumericValue when values fail numeric parsing.