def mdst(x, odd=True):
""" Calculate modified discrete sine transform of input signal
Parameters
----------
X : array_like
The input signal
odd : boolean, optional
Switch to oddly stacked transform. Defaults to :code:`True`.
Returns
-------
out : array_like
The output signal
"""
return -1 * numpy.imag(cmdct(x, odd=odd)) * numpy.sqrt(2)
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