def convert_units(column):
    """
    Convert units in given column.
    
    Inches are converted into centimeters and pounds are converted into 
    kilograms.
    
    - column: series to be converted
    - return: series with converted units
    """
    if column.name == "weight":
        return column *0.453592
    elif column.name == "height":
        return column * 2.54
    else:
        return column