[Octave-bug-tracker] [bug #57132] [octave forge] (control) step: size of output y is not same as the size of input t

[Mike Miller]

Update of bug #57132 (project octave):

                  Status:                    None => Confirmed              

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Follow-up Comment #2:

I can confirm this. I believe the OP chose these values particularly to show
the error. There might be some kind of round off or truncation error going
on.

Two different ways of initializing the T vector show the same problem:


sys = tf([1 1], [1 4 5]);
T = (0:0.01:0.59)';
y = step (sys, T);
assert (size (y), size (T))


and


sys = tf([1 1], [1 4 5]);
N = 59;
T = (0:N)' ./ 100;
y = step (sys, T);
assert (size (y), size (T))


If the T vector is 59 or 61 elements instead of this example of 60, the output
seems to be correct. Specifically, the same output is produced for t1 and t2
here:


t1 = (0:59)' ./ 100;
y1 = step (sys, t1);
t2 = (0:58)' ./ 100;
y2 = step (sys, t2);
isequal (y1, y2)


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