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# scipy.signal.step

`scipy.signal.``step`(system, X0=None, T=None, N=None)

  Step response of continuous-time system.

  Parameters: | system : an instance of the LTI class or a tuple of array_like describing the system. The following gives the number of elements in the tuple and the interpretation: 2 (num, den) 3 (zeros, poles, gain) 4 (A, B, C, D) X0 : array_like, optional Initial state-vector (default is zero). T : array_like, optional Time points (computed if not given). N : int, optional Number of time points to compute if T is not given.
  Returns: | T : 1D ndarray Output time points. yout : 1D ndarray Step response of system.

  See also

  `scipy.signal.step2`