Function interp_data_viewport 

fn interp_data_viewport(
    args: &[RValue],
    named: &[(String, RValue)],
    _context: &BuiltinContext<'_>,
) -> Result<RValue, RError>

Create a viewport with scales determined by data ranges.

@param xData numeric vector of x-axis data @param yData numeric vector of y-axis data @param extension fraction to extend scales beyond data range (default 0.05) @return a viewport object with appropriate xscale/yscale