def bar(x, y, **kwargs):
    """Draws a bar chart in the current context figure.

    Parameters
    ----------

    x: numpy.ndarray, 1d
        The x-coordinates of the data points.
    y: numpy.ndarray, 1d
        The y-coordinates of the data pints.
    options: dict (default: {})
        Options for the scales to be created. If a scale labeled 'x' is
        required for that mark, options['x'] contains optional keyword
        arguments for the constructor of the corresponding scale type.
    axes_options: dict (default: {})
        Options for the axes to be created. If an axis labeled 'x' is required
        for that mark, axes_options['x'] contains optional keyword arguments
        for the constructor of the corresponding axis type.
    """
    kwargs['x'] = x
    kwargs['y'] = y
    return _draw_mark(Bars, **kwargs)