Suba Thomas
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 Feb19 awarded Yearling Feb9 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. Jan28 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? Jan13 answered StateSpaceModel- damped oscillator Nov26 answered Numerically Simulating a Simple Differential Equation: RC Circuit Nov21 revised Why does LyapunovSolve solve non-standard form? Updated based on commnets Nov21 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... Nov21 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.) Nov20 revised Why does LyapunovSolve solve non-standard form? Updated answer based on comments Nov20 answered Why does LyapunovSolve solve non-standard form? Oct27 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. Oct1 revised Problems with RootLocusPlot Update based in improved performance in newer release Oct1 answered How to fix BodePlot that comes with Mathematica? Oct1 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. Oct1 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. Sep30 awarded Explainer Sep29 answered Extracting filter coefficients from a transfer function Sep5 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! Sep3 comment ToDiscreteTimeModel fails following video the matrices of the discrete-time model are correct. The problem is in handling of the variables. Sep3 answered ToDiscreteTimeModel fails following video