Dear all

How to avoid in plot "matrix in singular" in my pde system

> a1 := -2;
                                     -2
> b1 := 3;
                                      3
> c1 := -1;
                                     -1
> L := 15;
                                     15
> b := .25;
                                    0.25
> th := 1.5;
                                     1.5
> pde := diff(u(x, t), x, x, x, x, t...

Hello .

I need your help please .

how can i solve this kind of equations like : 61*a^2+1=b^2

I would like to index Variable names like how it is common in physics (just as an addition to the variable name to distinct between say t_a and t_b just as two different times). However i am not sure how to do this and make maple treat for example t_a EXACTLY like if it would be called ta.

int(1/2*m*(-x[b]+x[a])^2/(-tb+ta)^2,t = ta .. tb)

is evaluated but

int(1/2*m*(-x[b]+x[a])^2/(-t[b]+t[a])^2,t = t[a] .. t[b])

I'm trying out this example code, which I have succesfully used before, but now it's giving me this error. I tried with the simplest example, but i still get the error. One answer to this topic was an "extra space" in the definitions, but i've checked with and without spaces and i still can't find what is wrong... Anyone has any ideas?
thank you

> with(DEtools):
> ode1 := d*x(t)/dt = x(t);

                         d x(t)       
                         ------ = x(t)

Hello Everybody.

Im new to Maple, so i have a couple of questions. In the last few days I have learned the basic of Maple, and now i would like to solve an differential equation.

The Math question is:

Enter the solution of differential equation:

http://www.studieportalen.dk/forums/ShowFile.aspx?id=1122047

In the link i have put in the informations from the math question.

f(t)=(3sin2t,4cos2t) this function. t=pi/6   tangent line ?

Hi, i'm fairly new to maple and i'm trying to create a list of equations to solve but I can't see where I'm going wrong.

Hi,

I am new to Maple and intended to solve a differential equation (at least numerically) but i encountered some problems. I attached the Maple file. Equation 1 is the DE, which has the general solution seen in (2).

The general solution can be taylored to match certain boundary conditions (see (3)) which in this case are y(5)=1 and y(10)=5. I eventually plotted the function.

However when i tried to obtain a numeric solution i got an error from Maple...

Dear,

======================== This code will give error ============

restart;

with(Statistics);

i:=1:

RandomVariable(ProbabilityTable([1/2,1/2]));

=========================

I  used Maple12 and had a hard time debugging my code to find the error . Finally, I found that when we assign the name i a value, then the RandomVariable(ProbabilityTable([...]) will give error message below:

Error, (in Statistics:-Distribution...

the question is 

Consider the function φ(x, n) defined as

Define a functional operator “phi” in order to evaluate φ(x, n) when we enter the command phi(x,n);.

Use Maple to draw a surface plot of this function for x ∈ [0,20] and n ∈ [1,20]. Your plot should have axes displayed and be fully labelled and titled.

Hello, can you help me? I need to draw a simple model of solar system (9 planets around the sun). I tried to draw planets with

> a[1] := animate(implicitplot3d,

                            [

                    ...

I am trying to solve a system of nonlinear 36 differential-algebraic equations numerically in Maple. The last line of my code is the dsolve(.) command which is used to solve the DAE system. My problem is that it takes forever to evaluate the dsove(.) command. Maple does not give me any errors/warning, however, it keeps evaluating, and evaluating...nothing happens...

I have used stiff solvers as well hoping to make the process faster but that dowsn't work either.

Hey there, this is my first post here, so hello to everyone.

I have (so far) one question. I have a circle equation like

x²+y²-6y+6=0

I know, that on a paper, I can convert it to the "normal" circle equation, from which I can read the middle point and radius of the circle. And now my question is, how to convert in in maple? I am using the 11th version.

I have tried solving this equation and (x-a)

How can I plot standing waves with extra parameters. That is how can I plot something like 2A*sin(kx)*cos(wt) and vary the parameters to see what would happen if different types of waves traveling in different directions collided.

I would like to export-to-file a list containing equations, variables, and constants, e.g.

xyz := [dx = x*y-(1/3)*(y-z), dy = -0.01*x, dz = z/10];

I have used fprintf to write to a file. The closest I got to what I want is by doing:

fd := fopen("xyz.m", WRITE) :
fprintf( fd, %s,  CodeGeneration[Matlab](xyz,'output'=string) ):
fclose(fd) :

Using CodeGeneration[Matlab] was the only way I found to export a list like xyz above, simply writing fprintf...