# Items tagged with differentialdifferential Tagged Items Feed

### Numerical solution of nonlinear differential equat...

September 10 2012
0 4

Hello everyone,

I'm trying to solve the following nonlinear differential equation with the given boundary conditions.

### How to solve differential equation for potential...

July 18 2012
0 1

Dear Maple Users

I wonder how I can use Maple to solve the problem:

for the potential \phi(r). The problem is from the artikle: http://en.wikipedia.org/wiki/Electric-field_screening

I'm particularly puzzled how to implement this differential operator and how to enter the Dirac delta function.

Thanks for any hints.

### Implementing Differential Operator applied to Matr...

July 09 2012
1 1

Hello,

I am quite new to Maple and require some help on vector calculus. I have a differential operator in matrix form C that has to be applied to a column vector B.

C = [d/dx   0    d/dy]

[0     d/dy  d/dx]

and

B = [

### for loop must be numeric or character troubles wit...

June 21 2012
0 1

Hi,

I'm trying to use powsolve to give me the power series of a differential equation. It's been working wonderfully, afaik, but once I put in exp(x) it refuses to run. Here's my code:

>with(powseries);

>a := powsolve(diff(y(x), x, x)+y*exp(x) = 0, y(0) = 1, (D(y))(0) = 2); tpsform(a, x)

and the error I'm getting:

Error, (in powseries:-powsolve) final value in for loop must be numeric or character

### do maple have tool to get differential identity...

May 27 2012
0 3

A := diff(Y,y$2)-(y11)^2*diff(Y,y) = 0 B := diff(diff(Y,x),y) - y11*diff(Y,x$2) = 0

do maple have tool to get differential identity, or simple algebra identity?
that identity is an equation in terms of A and B and y11, not Y

### how to plot with DEplot and odeplot in the polar c...

May 01 2012
0 1

today, i stuty a differential equation,  firsy, i conver the equation from cartesian to polar as  follow:

restart:

sys := diff(x(t), t) = -y(t)+x(t)*(1-2*x(t)^2-3*y(t)^2), diff(y(t), t) = x(t)+y(t)*(1-2*x(t)^2-3*y(t)^2):

then  using transformation x=r*cos(theta),y=r*sin(theta) convert it to polar coordinate,and get:

sys1:=diff(r(t), t) = r(t)*(1-2*r(t)^2-r(t)^2*sin(theta(t))^2), diff(theta(t), t) = 1

then  plot...

### how to deal with these warning?...

April 27 2012
0 2

i study a simple differential equations as follow and get the solution,but i faced two warning which puzzle me:

> restart;
> eq2 := diff(x(t), t) = x(t), diff(y(t), t) = x(t)^2+y(t)^2-1;
ans1 := dsolve({eq2, x(0) = 1, y(0) = -1}, numeric, [x(t), y(t)], range = -10 .. 10)       ;

Warning, cannot evaluate the solution further left of -1.1646698, probably a singularity

### How do I solve invalid input in the proc?...

April 07 2012
0 1

Hey,

i have 2 differential equations and want to solve the first one when x is positive and the second when x ist negativ. For this problem i wrote the follwing procedure. But when i try i have the posted error. Has someone a good idea to help me?

Thanks a lot

> DGL3 := 10*(D(D(x)))(t) = x(t);

> DGL4 := 10*(D(D(x)))(t)+5000 = x(t);

Tsolver:=proc()
global DG1, DG2, func, var, var_min, var_max, x, Dx, N:

### How do I determine the general solution of the sys...

April 07 2012
0 1

I need to determine the general solution of the system of differential equations.

System of equations:

dx/dt = 2x-2z

dy/dt = 2y+2z

dz/dt = -2x+2y+4z

Thanks for the help!

### Plotting non-linear differential equation...

April 03 2012
0 2

Hello,

I'm new to Maple and am using it to solve linear and non-linear differential equations.

I can solve and plot linear DEs using a couple of methods. Im trying to solve a non-linear DE and i could find the series solution using dsolve. But given certain initial conditions, is there any way to plot or see the nature of the behaviour of the DE? I just want to see how the DE will look like maybe for certain points up to a certain level of accuracy. Is there any way to do that?

### Mechanics. Trajectory Plot...

March 31 2012
0 1
I am fairly new to Maple and trying to understand the dsolve command for numerical solutions and plotting graphs of radial distances and trajectory plots.
This is my code below. All of it successfully brings up a solution apart from the very last command and I don't understand why it is not working.
I believe the last plot is plotting a trajectory plot but I am not sure. I am meant to use the solution to plot the trajectory plot (X(t),Y9t))=(r(t...

### dsolve complicated?...

March 31 2012
1 4

The following is a differential equation with separable variables.  It is solved with dsolve and "manually".  Why is the dsolve solution so complicated?

Ratch

### problems about displaying the mathematics symbols...

March 30 2012
0 1

First,a Maple file is exported as the html file,but it took too much time to load the applet(com.maplesoft.applets.MathMLViewer)to display the mathematical symbols,such as the symbols of integral and differential,as shown in Figs.1 and 2.How to accelerate
Second,the problem will occur in the browsers of IE and firefox that the equation is incomplete display as shown in Figs3.Is there a method can handle the problem?
The last,using the...

### commutator of differential operators...

March 06 2012
1 1

I am trying to compute commutator like this [d_t +J_x,d_x+J_t], where d_t and d_x are differential operators, J_x and J_t, which contains generators of group, are some currents on group manifold. terms like this [J_x,J_t] could sovled by physics package, but how to manipulate [d_t,J_x]? How to define operator d_t in order to make the commutator works? and if it works we might have another problem as [d_t,J_x]=[d_t, J^a_x*T_a], where T_a are generators, the result is T_a *d_t(J^a_x...

### differential equation...

February 14 2012
0 0

i have a differential equation like the one below

i want to solve for C. i want to solve for C , is there a command i can use. i can't find it in maple help. i just started to use this software. please help

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