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visits member for 1 year, 11 months
seen Apr 17 at 10:39

Apr
14
comment How to parallelize this code
Just to use all cores in computing the M
Apr
1
comment Plotting solutions of a 4th order polynomial equation
Thank you Suba Thomas. This is it.
Mar
31
comment Plotting solutions of a 4th order polynomial equation
I don't understand light and dark green and lines there while roots moving
Mar
24
comment NDSolve in exact points - nonlinear equation (Degrees and Radians confusion)
so professional code
Mar
24
comment NDSolve in exact points - nonlinear equation (Degrees and Radians confusion)
Thank you very much
Mar
23
comment NDSolve in exact points - nonlinear equation (Degrees and Radians confusion)
I used FindMaximum[zsol[t], t] on the segment but doesn't work? I obtained value which is not maximum because I can see from the diagram
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
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
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
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
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
comment Mapping the imaginary axis of the complex (s) plane
@bill s how to implement RootLocusPlot on this equation?
Mar
11
comment Numerical method for solving a polynomial equation
thank you very much
Mar
9
comment Numerical method for solving a polynomial equation
how to be sure that there are only two roots. I know that all of them should be complex, but more then two. Thank you anyway.
Mar
5
comment How to Solve/NSolve/Reduce this rationalized equation
thank you b.gatessucks