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Differential Equations

- An equation involving derivatives of a function or functions. Solving ODE and PDE
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Jan16-12 Greg Bernhardt
My intent is to create a thread for people interested in Differential Equations. However, I will explicitly state that...
Jul3-12 07:18 PM
Luccas
95 138,247
Please post any and all homework or other textbook-style problems in one of the Homework & Coursework Questions...
Feb23-13 09:24 AM
micromass
1 30,064
What method can I use to analytically solve the following 2nd order PDE? u=u(x,t) ∂u/∂t - a*x*∂u/∂x-D*∂^{2}u/∂t^{2}...
Oct30-11 03:05 AM
pangyatou
1 1,072
Haiya :P In the process of trying to find the solution of a 1st order PDE, I've reached a point where I have to...
Sep29-09 05:02 AM
BobbyBear
5 1,071
Hi, I am not sure if this is the correct forum, but... I am working with FFTs of real signals. I have a FFT of...
Oct21-13 11:13 PM
swraman
7 1,071
Hello guys, Which method can we use to solve the differential equation below? dy/dx= 1/(xy+x^2y^3) It doesn't...
Apr7-05 09:07 PM
Lyuokdea
5 1,070
HI guys. Haven't been here in a while... I have an algorithm attached that uses the levenberg marquardt non linear...
Feb5-13 01:49 PM
a.mlw.walker
0 1,070
I'm having trouble finding out how to set up Neumann (or, rather, "Robin") boundary conditions for a diffusion-type...
Nov12-12 10:58 AM
Vargo
1 1,070
Given a function: z(x,y) = 2x +2y^2 Determine ∂x/∂y , Method 1: x = (z/2) - y^2 ∂x/∂y = -2y Method 2:
Nov14-13 06:05 AM
SteamKing
8 1,070
Hey guys, I have a pretty simple question but I can't seem to find the answer anywhere. is y''+xy'-5=(x^2)(e^y)...
Jan22-10 09:07 AM
matematikawan
2 1,069
I am solving a problem involving Lagrange Multipliers and calculus of variations and have the equation: f_{x} -...
Feb1-12 04:45 PM
shank8
0 1,069
I don't understand what my professor told me. He said that if a fourieer series of a function f is not continuous then...
Dec8-09 11:13 PM
LCKurtz
4 1,068
so im working on a problem and i have a question about the step function. lets say that a decaying force is f(t). with...
Nov22-11 12:49 AM
I like Serena
1 1,068
I'm having trouble understanding the concept of laplace transformations. my book states that it is comparing how...
Apr26-05 09:04 PM
Corneo
1 1,066
I'm trying to solve this equation: Ux + Uy + U = e^-(x+y) with the initial condition that U(x,0)=0 I played...
Apr12-10 08:09 PM
gato_
2 1,066
Hi Everyone, Apologies if this is posted in the wrong place. I am trying to produce numerical solutions for the...
Jan25-11 10:37 AM
rs12345
0 1,066
Hello, What does laplace transformation exactly 'do'? If I have PDE of second order and use LT on it, what do i...
Dec4-11 05:02 PM
hunt_mat
1 1,066
Can anyone tell me if this ODE has an analytic solution? And if it does, how the heck might I go about it? ...
Dec10-10 06:46 AM
JJacquelin
4 1,065
Is this problem possible? Solve the initial value problem x''(t) + 6x'(t) + 9x(t) = f(t); x(0) = N, x'(0) = M ...
May18-11 04:35 AM
JJacquelin
1 1,064
Having a bit of trouble with this equation, I need to find V explicitly and this would obviously be done by...
Apr28-12 08:40 AM
JJacquelin
5 1,064
I was going through my notes on different finite difference methods and came across something I don't quite...
Feb26-12 11:54 AM
O_chemist
0 1,063
can any one know how to derive the Lax pair for the cubic nonlinear schrodinger equation? currently I am interested...
Mar16-11 07:23 AM
saravanan13
0 1,062
Eq u'(x)+p(x)u=f(x) with initial condition u(0)=0 It's homogenous solution is u_h=Ce^{-\int^x_0 p(s)ds}
Jan7-12 05:14 PM
matematikuvol
3 1,062
How can we say: f(x)=A'sin(kx)+B'cos(kx) or equivalently f(x)=Ae^{ikx}+Be^{-ikx}?? How are these two...
Nov18-12 04:44 AM
M. next
6 1,062
So this question pertains to some process engineering homework i have, which is basically the following: I have an...
Feb5-09 12:09 AM
matematikawan
1 1,061
Hi I have been trying to figure out how this method works. Searched the forum but got no results. Have attached an...
May15-10 11:40 AM
LCKurtz
3 1,061
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...
Oct18-11 06:43 PM
bloodlines
4 1,061
Find the Particular Solution. Show the steps of derivation, beginning w/ the general solution....
Nov23-10 12:10 PM
Matthew Rodman
1 1,061
Hi Mathematicians, I recently encountered this problem in maximization... Maximize 1170X1 + 1110X2 Subject to 1. ...
Feb2-11 07:34 AM
chwala
2 1,061
For a general dynamic system: dXi/dt = Fi(X1, X2,...,Xn), i=1,...,n, Q.1 do you have some ideas of the existence...
Jun29-11 01:36 AM
Eynstone
1 1,061
Hello, I am trying to write a program on matlab using ode45 to solve the following equations: S'=-bSZ-sS...
Aug26-11 11:21 PM
klinklindeman
0 1,061
Ok, I know how to separate variables in solving an ODE. I am unable to understand a solution I have for a problem...
Jul13-12 06:29 PM
ericm1234
2 1,061
I am trying to solve an ODE and PDE and I am having problems coming up with a method for doing so. The PDE is: ...
Jun30-13 07:53 AM
dm164
5 1,060
Can anyone help me with a simple algorithm or code for a Finite difference Time domain scheme to implement in Matlab....
Jun30-08 01:23 PM
chitambira
0 1,060
There seems to be something wrong with the LaTeX This seems like an absolutely trite question, but I can't seem to...
Jun3-09 06:26 PM
dev00790
1 1,060
Hello all, During the course of a calculation I was doing for my research, I derived a delay integral equation of...
Jul15-10 02:58 PM
Mute
2 1,060
Hey guys, I'm sure i'm doing something really daft in not getting this to work, but... I want to use NDSolve to...
Jul5-10 02:39 PM
rabbahs
1 1,059
I want to solve the boundary value problem: Laplace's equation for u(r, theta) = 0, 1 < r < 2, 0 < theta < a ...
Apr22-11 11:31 AM
Engineer214
2 1,058
I would like to ask if anybody knows something about the methods of solving infinite linear autonomous systems of...
Jul31-13 12:01 PM
Mandelbroth
3 1,057
Hello, In my Differential Equations class we are learning about modelling with first order differential equations....
Sep28-13 02:55 AM
UltrafastPED
3 1,057
Hello all, I was wondering if you could share your thoughts regarding how one should go about solving PDEs in which...
Oct28-10 02:20 PM
masnet
0 1,056
Hello guys, I am new here to the forum and I was wondering if you could help me with some trouble I am having with...
Oct29-10 11:56 AM
Funzies
2 1,056

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