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Apr
30
awarded  Notable Question
Apr
22
awarded  Popular Question
Apr
19
awarded  Popular Question
Mar
28
comment The numerical solution of a nonlinear ODE: boundary value problem
Could you please cite the paper by any chance? Thank you.
Mar
26
comment The numerical solution of a nonlinear ODE: boundary value problem
Could this be a version related issue? I just started a fresh kernel and the problem solved fine "right out of the box" using NDSolveValue: NDSolveValue[{(y^\[Prime]\[Prime])[x] == 204/100 (1 - x) (1 + Derivative[1][y][x]^2)^(1/2 ) + ( 1 + Derivative[1][y][x]^2)/y[x], y[0] == 1, y[1] == 1}, y[x], {x, 0, 1}]
Mar
26
comment The numerical solution of a nonlinear ODE: boundary value problem
Could you share a little about the physics that this equation is solving? That way someone may be able to tell you about any well established boundary condition issue or specification with physical insight, perhaps? It would seem that it is the final term in your equation (1 + Derivative[1][y][x]^2)/y[x] causing the issue.
Mar
4
awarded  Popular Question
Feb
22
awarded  Nice Question
Feb
21
comment How to solve 3D heat equation with Neumann B.C
Firstly, it would seem that BC1 has not been defined. I assume this is an initial condition?
Feb
20
comment Implementing a boundary condition that is dependent on the solution
Could you post your problem statement along with the code? Seems like the heat equation.... with two BCs defined at x=L? Describing the physics may help.
Feb
13
comment Is it possible to make a mathematica program which can be viewed online by anyone?
This asks me to sign in with my Wolfram ID and password. I guess "public" would need to have a Wolfram ID to access this manipulate object?
Feb
7
comment Using NDSolve to find particle trajectory
what is the difference with this. In the latter answer, the author did not have to make m a 3D vector. In the current problem, is it the addition of q*E that leads to two matrices that may not be "added" together?
Feb
7
comment Using NDSolve to find particle trajectory
EquationSimplification->"Residual" is magic?
Feb
7
comment Using NDSolve to find particle trajectory
I haven't worked with vectors in Mathematica so I may not be able to help with that. However, your ParametricPlot3D has incorrect syntax. Assuming that pos is the position, is your initial acceleration zero?
Feb
6
comment Lyapunov Exponent
Yes, this package is golden! Its awesome.
Feb
6
comment WhenEvent and Resetting of Variable in PDE when operation succeeds
@march Indeed! Wow! Was that an easy fix or what...
Feb
6
comment WhenEvent and Resetting of Variable in PDE when operation succeeds
@Dr.belisarius So, how do I proceed? I am sorry but I do not have a clue. What you say makes sense.
Feb
6
accepted Phase Portrait to Differential Equation
Feb
6
asked WhenEvent and Resetting of Variable in PDE when operation succeeds
Feb
3
comment Phase Portrait to Differential Equation
@Searke Good point. However, I do mention given data that made the phase portrait.