Solving a Complex Second-Degree Ode with Bessel Functions | MATLAB Help

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Discussion Overview

The discussion revolves around solving a complex second-degree ordinary differential equation (ODE) involving Bessel functions and polynomial terms. Participants explore the formulation of the ODE and seek assistance with MATLAB for finding solutions.

Discussion Character

  • Technical explanation, Homework-related, Debate/contested

Main Points Raised

  • One participant presents the ODE d²y/dz² = (i/a*z + b)*y, where i is the imaginary unit and a, b are constants, and mentions obtaining a summation of Bessel functions.
  • Another participant points out that the formulation of the equation is ambiguous and suggests multiple interpretations of the term 1/a*z + b.
  • The original poster clarifies the equation as d²y/dz² = i*y/(a*z + b) and seeks a solution for a more complex form involving a cubic polynomial in the denominator.
  • A suggestion is made to use Wolfram Alpha for obtaining a solution, although the participant admits uncertainty about the solution process.
  • The original poster expresses hope for finding a solution to the cubic polynomial equation.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the interpretation of the original equation, and the discussion remains unresolved regarding the best approach to solve the ODE.

Contextual Notes

The discussion highlights ambiguities in the mathematical formulation and the complexity of the equations involved, which may affect the clarity of the problem and potential solutions.

bloodlines
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Hi friends,

I have been trying to solve the ode of second degree below:

d2y/dz2=(i/a*z+b)*y

i is the complex i, a and b are constants

i ended up with the summation of bessel functions of first end second kind. Then I checked with MATLAB ode solver it gives no explicit solution. please help me.

Thank you so much!
 
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First, your problem is not well written. 1/a*z+b could be interpreted as (1/a)z+ b, or as [1/(az)]+ b, or as 1/(az+ b).
 
sorry about that

it is:

d2y/dz2=i*y/(a*z+b)

i is complex i not a symbol

i am also looking for a solution for this wrt z:

d2y/dz2=i*y/(a*z^3+b*z^2+c*z+d)

thank you!
 
thank you so much. i hope i can find a solution to the equation with 3rd degree polynomial.
 

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