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 Yearling
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Feb
19
awarded  Yearling
Feb
9
comment OutputResponse in V9 vs V10
This is a bug. The workaround for now is to convert thisWcA, Wp23, or the final system to a StateSpaceModel.
Jan
28
comment Selecting values over lists for discrete inputs in NDSolve
@antonio 1)Are you sure that this is a model of a tank system. See wolfram.com/xid/0jvpj762zmgvepb9y3y1-veaqch, Bernoulli's law does not end up with the equation you have. 2) Are you mixing discrete- and continuous-time dynamics?
Jan
13
answered StateSpaceModel- damped oscillator
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