[Octave-bug-tracker] [bug #52929] Impulse Versus Step

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?52929>

                 Summary: Impulse Versus Step
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Fri 19 Jan 2018 12:12:29 AM UTC
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Inaccurate Result
                  Status: None
             Assigned to: None
         Originator Name: Carlos Montalvo
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.0.0
        Operating System: GNU/Linux

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Details:

The following code produces two different lines but mathematically it should
be the same. That is if you solve these two equations by hand they should
produce the same result. I've mathematically and experimentally proven that
the impulse() function in the control system toolbox produces inaccurate
results. The step() function works just fine. That is the step() function
produces accurate results. Not sure it if helps but the issue does not occur
in MATLAB or Python.



sys_step = tf([3],[1 5]);
step(sys_step)

figure()
sys_impulse = tf([3],[1 5 0]);
impulse(sys_impulse)



I suggest taking a look at the impulse() function and determining what the
error could be.




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