import holoviews as hv
hv.extension('bokeh')

xs = range(-10,11)
ys = [100-x**2 for x in xs]

curve = hv.Curve((xs, ys))
curve

"Object 'curve' has kdims {kdims} and vdims {vdims}".format(kdims=curve.kdims, vdims=curve.vdims)

trajectory = hv.Curve((xs, ys), 'distance', 'height')
trajectory

"Object 'trajectory' has kdims {kdims} and vdims {vdims} ".format(kdims=trajectory.kdims, vdims=trajectory.vdims)

wo_unit = hv.Curve((xs, ys), 
                   ('distance','Horizontal distance'), 
                   ('height','Height above sea level'))

distance = hv.Dimension('distance', label='Horizontal distance', unit='m')
height = hv.Dimension(('height','Height above sea level'), unit='m')
with_unit = hv.Curve((xs, ys), distance, height)

# (using + to compose elements is described in the next guide)
wo_unit + with_unit

renamed_height = trajectory.redim(height='altitude')
renamed_height

renamed_height.redim.label(altitude='Altitude above sea-level', distance='Horizontal distance')

low_ys = [25-(0.5*el)**2 for el in xs]
shallow = hv.Curve((xs, low_ys), group='Trajectory', label='Shallow')
medium = hv.Curve((xs, ys), group='Trajectory', label='Medium')
shallow + medium