[Octave-bug-tracker] [bug #48138] control package: impulse function scales impulse response incorrectly

[Mike Miller]

Update of bug #48138 (project octave):

              Item Group:        Incorrect Result => Regression             
                  Status:                    None => Confirmed              
        Operating System:       Microsoft Windows => Any                    
                 Summary: Impulse function of the Control Package => control
package: impulse function scales impulse response incorrectly

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Follow-up Comment #4:

I rewrote the posted script (and quoted in a verbatim block) to make it
clearer what the computed parameters are:


t = (0:.1:30)';
NUM = 0.9375; DEN = [1 2 4];
sys = tf (NUM, DEN)
yi = impulse (sys, t);
yii = NUM ./ sqrt (3) .* exp (-t) .* sin (sqrt (3) .* t);
figure
plot (t, yi, t, yii)
title ("Impulse Response of LTI System")



I can also confirm that this works correctly in control version 2.8.5 but not
in 3.0.0.

With version 3.0.0, if I scale the impulse response by the sampling period, I
get something that more closely agrees with the correct result, especially as
dt is made smaller.

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