Tagged Questions
1
vote
1answer
77 views
What does the Error Message in DSolve really mean?
Having this ordinary non linear differential equation
$$y'-x^2 (y+1)\cdot (y+2)^2= 0$$
with the boundary condition $y(4)=2$. When trying to solve this one with Mathematica by using
...
2
votes
1answer
69 views
Infinite Expression Error from NDSolve
I am trying to solve a differential equation numerically. So I have
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0
votes
0answers
48 views
NDSolve::ndfdmc: Computed derivatives do not have dimensionality consistent with the initial conditions. >>
I am trying to solve this NDSolve problem and I am getting the above error and do not know why. Here is what I have:
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3
votes
2answers
99 views
How can I get WhenEvent to recognize criterion I specify?
Using NDSolve I want to solve a differential equation till a quantity which is a function of the dependent variables reaches a certain value. My functions and criteria are complicated, but I am able ...
5
votes
1answer
111 views
How can I deal with an NDSolve::ivone message regarding boundary values?
I have a question regarding the error message:
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1
vote
0answers
148 views
NDSolve error when solving a BVP
I'm trying to solve the following BVP with unknown parameters (p and phi) using NDSolve over the period {Pi, 2 Pi}:
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2
votes
2answers
300 views
Problem with NDsolve for a system of equations
I want to solve a system of differential equations which is not very complicated, but I cannot handle the problem with mathematica!!
Please have a look at the problem and result and help me with your ...
4
votes
2answers
276 views
How to set the initial condition? (to make IC and BC consistent)
I want to find the initial condition which fits mixed boundary condition of Phi[r, Theta, t].
The original initial condition in text is
Phi[r, Theta, 0] == 1
. ...
2
votes
1answer
307 views
Inconsistent initial and boundary conditions
I have a 4th order nonlinear PDE with the following BCs and IC:
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7
votes
1answer
189 views
What does MaxStepFraction do?
I find that with NDSolve[...] while solving a partial differential equation, changing the MaxStepFraction from ...
