Recent content by pendulum

  1. P

    Numerical Analysis - Construction of a Poincare surface of section

    (I am not sure whether I'm posting in the right forum. I apologize if I do) Does anyone have an alrorithm or a code (in any language) that constructs a Poincare surface of section? I want to do so for a Hamiltonian model: A mass under the influense of the Henon-Heiles potential. It has to...
  2. P

    Is this pre algebra problem correctly solved?

    Again, you're right. I 'm sorry.
  3. P

    Is this pre algebra problem correctly solved?

    I thought products meant roots.
  4. P

    Is this pre algebra problem correctly solved?

    Ok I'm sorry. Stop shooting! The problem is with my english.
  5. P

    Is this pre algebra problem correctly solved?

    (x+1)(x-2) = (x^2) -x -2 = 0 -> x1= 2 and x2= -1 (4x-2)(-x+3) = -4(x^2) +14x -6 =0 -> x1 = 3 and x2 = 0.5 But again, it has nothing to do with the first one.
  6. P

    Can someone give me the solution of that trinomial

    I don't understand what you mean. I' ve done nothing. I don't have a mathematica I that's what you are asking. I don't remember the Horner 'thing' or the polynomial division, and I was wondering if someone could help me.
  7. P

    Is this pre algebra problem correctly solved?

    I've just checked my answers and they are absolutely right. Unless you are not asking for the solution of the -3(x^3) ( 2(x^3) + 3x - 4) = 0 What you've written (about the 2 others) has nothing to do.
  8. P

    Is this pre algebra problem correctly solved?

    x1=x2=x3=0 x4=0.879615 x5= -0.439807 + i 1.44232 x6= -0.439807 - i 1.44232 I found arithmetically. I hope I'm right
  9. P

    Can someone give me the solution of that trinomial

    Sorry I meant "m"
  10. P

    Can someone give me the solution of that trinomial

    :redface: Can I please have the solution of the trinomial x^3+(11+(8/3))*x^2+(8/3)*(m+10)*x+(160/3)(m-1)=0 in terms of the unknown variable "t"? I' ve heard that it can be done in 'mathematica'.
  11. P

    A question about a nonlinear oscillator

    I am not sure whether I understand what you mean, but the A in the e^At wasn't stable (or linear if better).
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    A question about a nonlinear oscillator

    Thank you Tantoblin.
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    A question about a nonlinear oscillator

    I used e=0.3 which is not that small. So I dropped the R-K4, and used a matrix of the form e^At for the numerical integration, and the system did fade out. So I guessed that R-K4 was to accurate for this case. At least for the times 'I could reach'. You see I've been running the integration...
  14. P

    A question about a nonlinear oscillator

    I numerically integrate the following nonlinear oscillator: x''(t) + e (x'(t)^3) + x(t) = 0 , where e<<1 and what I get is a limit cycle. The energy derivative appears to be negative , which means that x(t) approaches zero while t approaches infinity. I also used the analytical...
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