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  • 0 posts edited
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  • 18 votes cast
Mar
31
asked Plotting solutions of a 4th order polynomial equation
Mar
25
asked ExpToTrig transforms solution to 4th order ODE into unwanted form
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
revised NDSolve in exact points - nonlinear equation (Degrees and Radians confusion)
added 207 characters in body
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
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