# Tagged Questions

Questions on the symbolic (DSolve, DifferentialRoot) and numerical (NDSolve) solutions of differential equations in Mathematica.

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### ContourPlot using ElementMeshSurfacePlot3D

I would add contours for iso-level values of a FEM solution of a PDE on a generic 3D region; for visualization of values on the boundary I have used ElementMeshSurfacePlot3D of NDSolveFEM Package (as ...
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### Mass distribution in NDSolve

I'm trying to model the solar system with NDSolve, basically a numerical n-body solution. I model the initial positions of bodies from a data set thusly: ...
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### Getting a function/solution for an ODE over 2 dimensions

I am trying to calculate the laminar flow field within a tubular reactor. The relation between axial velocities, viscosity and pressure drop is given by this differential equation with the axial ...
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### Finding eigenvalues for Laplacian operator for 3D shape with Neumann boundary conditions

I've just begun to use the Mathematica so my question may seem to be naive. To get a solution for my problem I looked at the example provided in help. ...
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### getting a following error,large data points,desired output-best fit to expt. data sets

I am trying to carry out list operation but running into a following error I have large data sets(more than 0.2 million data points) and desired output will be a best fit (numerical data points ) to ...
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### Confusion with Neumann and Dirichlet

If I solve Laplace's equation with Neumann boundary conditions then everything is defined via derivatives. Consequently one needs to fix a point with a specific value to get a solution. However if I ...
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### How to solve a differential equation system involving complex conjugates?

Consider the following system of differential equations sys = {y'[t] == g*z[t], z'[t] == g*y[t], y[0] == y0, z[0] == z0}; which we can solve ...
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### Error witih DSolve [duplicate]

I am trying to solve these differential equations: ...
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### How to get value from InterpolatingFunction

I have numerically solved a system of ODEs using NDSolve. I can plot them using ParametricPlot but I am having trouble evaluating them at specific points and ...