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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.