scipy.signal.lti

class scipy.signal.lti(*args, **kwords)

Linear Time Invariant class which simplifies representation.

Parameters :

args : arguments

The lti class can be instantiated with either 2, 3 or 4 arguments. The following gives the number of elements in the tuple and the interpretation:

• 2: (numerator, denominator)
• 3: (zeros, poles, gain)
• 4: (A, B, C, D)

Each argument can be an array or sequence.

Notes

lti instances have all types of representations available; for example after creating an instance s with (zeros, poles, gain) the transfer function representation (numerator, denominator) can be accessed as s.num and s.den.

Attributes

A
B
C
D
den
gain
num
poles
zeros

Methods

bode([w, n])	Calculate Bode magnitude and phase data.
freqresp([w, n])	Calculate the frequency response of a continuous-time system.
impulse([X0, T, N])
output(U, T[, X0])
step([X0, T, N])