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  • 17 votes cast
Mar
23
accepted NDSolve in exact points - nonlinear equation (Degrees and Radians confusion)
Mar
23
comment NDSolve in exact points - nonlinear equation (Degrees and Radians confusion)
I think I can handle, thank you very much
Mar
23
comment NDSolve in exact points - nonlinear equation (Degrees and Radians confusion)
just for first cycle
Mar
23
comment NDSolve in exact points - nonlinear equation (Degrees and Radians confusion)
I need position of z, velocity z', angular velocity ϕ' and angular acceleration ϕ'' for various ϕ which I choose and for which t. It should be table of 6x7 of data? {z[t], z'[t], ϕ'[t], ϕ''[t], z''[t], t}
Mar
23
asked NDSolve in exact points - nonlinear equation (Degrees and Radians confusion)
Mar
23
comment Solutions of cubic equation D>0 or D<0
thank you very much. I just wanted to see which substitutions did you use for presenting the solutions.
Mar
22
comment Solutions of cubic equation D>0 or D<0
@ubpdqna code is great and everything is working. I just followed the code and in the last step I thought that if I substitute parameters I obtain in the last step {-1.03412, -1.03412, 0.467062 - 0.865364 I, 0.467062 + 0.865364 I, 0.467062 - 0.865364 I, 0.467062 + 0.865364 I} and solutions which code gave is {{x -> -0.000500125}, {x -> -0.000250062 - 0.316228 I}, {x -> -0.000250062 + 0.316228 I}}. My question is how to see roots in analytic form which you used in the code?
Mar
22
comment Solutions of cubic equation D>0 or D<0
@ubpdqna I have one thing which is not clear, why the last step Simplify[Chop[ps - a2/3]] is not giving solutions the same with NSolve[0 == 0.0000500125` + 0.100000250125` x + 0.00100025` x^2 + x^3,x] if I set parameters immediately on the beginning?
Mar
22
comment Solutions of cubic equation D>0 or D<0
ubpdqn Thank you very very much, it was my mistake in understanding any way.
Mar
22
accepted Solutions of cubic equation D>0 or D<0
Mar
22
revised Solutions of cubic equation D>0 or D<0
added 181 characters in body; edited title
Mar
22
asked Solutions of cubic equation D>0 or D<0
Mar
15
comment Symbolic solution of irrational equation
congrats Artes, I didn't know that this is possible to do. But I think in any case big knowledge is necessary for this
Mar
15
accepted Symbolic solution of irrational equation
Mar
15
asked Symbolic solution of irrational equation
Mar
12
comment How to apply RootLocusPlot corectly
@Öskå I picked up the point just on the part of the question already asked. To take a look is it better for understanding because the problem is more complex that I thought.My previous question is large and consists of few parts. I didn't get any sign for further analysis.
Mar
12
asked How to apply RootLocusPlot corectly
Mar
12
revised Mapping the imaginary axis of the complex (s) plane
edited title
Mar
11
comment Mapping the imaginary axis of the complex (s) plane
@bill s I tried RootLocusPlot[a6 r^2-a1 a3 k^4 - a2 a4 (-k a5 + r)^2], {k, 0, 0.01000}] but it is not that diagram
Mar
11
revised Mapping the imaginary axis of the complex (s) plane
deleted 1 characters in body