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Nov
26
answered Numerically Simulating a Simple Differential Equation: RC Circuit
Nov
21
revised Why does LyapunovSolve solve non-standard form?
Updated based on commnets
Nov
21
comment Why does LyapunovSolve solve non-standard form?
And that goes back to the original point - there is no standard form. Now for stability analysis we have to use the transpose but to obtain the controllability gramian we need not transpose...
Nov
21
comment Why does LyapunovSolve solve non-standard form?
So it looks like $\text{LyapunovSolve}\left[A^{\mathsf{T}},Q\right]$ is what needs to be solved. (I will update the answer after fully thinking this through. BTW, this is a separate issue from whether Q is on the lhs or rhs.)
Nov
20
revised Why does LyapunovSolve solve non-standard form?
Updated answer based on comments
Nov
20
answered Why does LyapunovSolve solve non-standard form?
Oct
27
comment What's the wrong when I use the BodePlot?
Read the documentation carefully for both ButterworthFilterModel and buttord. In one the units are in decibels, in another it is absolute values. In one the stopband is the number of decibels down from the passband, while it is not so in the other. These were the two I could quickly find.
Oct
1
revised Problems with RootLocusPlot
Update based in improved performance in newer release
Oct
1
answered How to fix BodePlot that comes with Mathematica?
Oct
1
comment On using DiracDelta[t] in OutputResposne in version 10. Different result from version 9
@Ed Mendes, the fix should be in the next release.
Oct
1
comment StateSpaceRealization “ControllableCompanion” does not generate ControllableCompanion form from DE
The StateSpaceRealization option was being ignored since v8 (and probably in CSP as well.) The fix should be in the next release.
Sep
30
awarded  Explainer
Sep
29
answered Extracting filter coefficients from a transfer function
Sep
5
comment On using DiracDelta[t] in OutputResposne in version 10. Different result from version 9
@Ed Mendes: Well, features need to be documented, but bugs need to be fixed!
Sep
3
comment ToDiscreteTimeModel fails following video
the matrices of the discrete-time model are correct. The problem is in handling of the variables.
Sep
3
answered ToDiscreteTimeModel fails following video
Sep
3
comment NonlinearStateSpaceModel: Trying to parse the documentation
The example text has a couple of typos. It should read $\ldots x_1'(t)=u(t)-x_1(t) x_2(t), x_2'(t)=u(t) x_2(t)+1 \ldots$
Aug
22
answered On using DiracDelta[t] in OutputResposne in version 10. Different result from version 9
Aug
22
comment On using DiracDelta[t] in OutputResposne in version 10. Different result from version 9
@Nasser, pls follow the suggestion from Jens. I will provide a more elaborate answer on why the behavior changed.
Aug
21
comment Laplace: from differential equation to transfer function
These are undocumented, so naturally the best way to hear about them is on sites such as these.