How do I do to draw a graph from an adjacency matrix? Notice: the matrix is symmetric and when I use GraphTheory package, occurs the error: "Error, (in GraphTheory:-Graph) an undirected graph cannot contain loops (loop detected at vertex 1)".

I've tried the "graphplot3d" command, but I need to know the in-degrees of each vertex (it´s a rotine). It's impossible, in this case, using the "InDegree" command.

Help me, please! Regards,
 

> PDE := diff(u(x, t), t) = k*(diff(u(x, t), x))+diff(u(x, t), x, x); > a := 1/70; > IBC := {u(0, t) = 0, u(5, t) = 0, u(x, 0) = exp(-(x-2.5)^2/(2*a^2))/((2*Pi)^(1/2)*a)}; > pds := pdsolve(PDE, IBC, numeric, time = t, range = 0 .. 5, timestep = 1/2000, spacestep = 1/2000); >R := pds:-value(output = listprocedure); >uu := subs(R, u(x, t))

Hi,all, here is my question: alias(alpha=RootOf(x^32+x^26+x^19+x^15+x^13+x^11+x^9+x^8+x^4+x+1)); and then i want to compute: alpha^12345678987654321; But when I did it in maple, it failed. I think there should be some way to do it. Would you like to help me? Thanks Gepo

I checked some formulas and realized, that my Maple version simply has no representation for some Greek symbols e.g. delta or epsilon, though it can print alpha, beta, gamma, xi omega. So if I type 'delta*alpha', Maple just prints 'alpha' though it calculates 'delta*alpha'.

Does anyone of you have any idea why this is the case, or even better, how I can change that?

Btw.: My version is 'Maple 12.0'.

Thanks.

Hi there!

Suppose I have an expression

Expr:=a*f(x[0],...) + b*f(x[1],...) + c*f(x[2],...),  

where the ellipses represent (different) functions of x[0]..x[2]. I'd like to use frontend to get the coefficients a, b, c corresponding to x[0], x[1] and x[2]. If the function f only has one argument, that's peanuts:

Hi,

How I do to run the commands of the package  in Maple 13?

Gracias

For some reason Maple just will not solve this...

2.160417096*x^(2.513) + 0.9921351694*x^(0.512) -15.95645167 = 0

It runs for about 10 minutes before I decide to give up.

The only thing I can think of is I had one of those 'lost kernel' messgaes the other day and I closed Maple while it was trying to restart the kernel so maybe that caused some problems with my system...

 

 

I want to factor the 34 th Fermat number.

F(n) := 2^(2^n) + 1

I can enter the 29th Fermat number: 2^(2^29) +1, and Maple will evaluate it.

I seem to be under the maxdigits limit:

>	kernelopts(maxdigits);

 

Hello Friends;

How could make maple show me the steps and rules applied in the following exerted?

3^(-2*x^2)*9^(-2*x^2-3) = (1/27)^(6*x-2);

Something very similar to the command:
Student[Calculus1][ShowSolution]
Thanks

 

I'm getting started with this. I'm reading books about General Relativity. Their notation uses superscripts and subscripts in Greek, for examples. But in the lessons for DifferentialGeometry and in applications I find in the Maple website, I see coordinate systems of (x,y), for example. Indices, raising and lowering, and other operations involve "d" and "D_" notation. Examples use something like T12 to represent what I would want to see as "T" with two subscripts having values of 1 and 2. I apologize if I'm not explaining the background to my question well.

Hi guys,

I am not a experienced user of Maple. So the question is probably very basic. Any help is appreciated.

I have 2 coupled first order linear equations. I may be able to solve them manually, but I thought it would be a perfect application for Maple. The problem is that I have no idea how to do it in maple. So here it goes.

d(y1)/dt = (a-y1)/T1 - k1*y1 + k2*y2;

d(y2)/dt = (b-y2)/T2 - k2*y2 + k1*y1;

Under the following constraint: a*k1 = b*k2;

How may I solve this problem in Maple?

 

Thanks a lot.

 

hey, I've made a almost all  of my mechanics work during the past year in a single Maple document. Now, for som reason, the document wont opendue to "There were problems during the loading process. Your work sheet may be incomplete" please help my, I would really hate loosing so much work...

Btw. mapleprimes wont let me upload the failed file so if someone could either post a guide/torturial or there email I would be vey pleased.

Hello, recently I am working to write a bash shell program combined with maple to automatically produce the codes to calculate functional and functional derivatives values for some given functional expression(This is provided by the user in maple input file). Now I meet a problem.

Take the codes below as an example:

I have written a procedure.  Without going into details, here is the pseudocode of the procedure:

time:=proc(begin,end,c,deltaT)

t:=0;
v:=0;
accel:=5
where-we-at:=a;

while where-we-at =/= end do

distance:=*distanceformula*;
where-we-at:=*where-we-at* formula;
t:=t+deltaT;
v:=someformula;
accel:=accelformula;

end do;
return(t);
end proc:

 

How do I create an exptression with absolutely no evaluation?

I would like my students to practice the order of operations, so I want to be able to display an expression without evaluation of any of the operations involved. Is this possible somehow?