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Hi,

I need to solve the heat diffusion equation in a system with two enclosed walls.  The first wall (made of a material called fr4) goes from x=0 o x=d1, and the second wall (made of copper, that is cu)from x=d1 to x=d2. 

u(x,t) is my unknown (change of temperature with time and space) for the first wall, and v(x,t) the unknown for the second wall.

So the system of PDEs to solve is:

>PDE:=[ diff(u(x,t),t) = afr4*diff(diff(u(x,t),t) ,

Contourplots...

January 26 2009 Lagrange 12

Hi!

I have a function in 2 variables - lets make it easy, the function is:

f(beta,c_0) = beta-6*beta*c_0+3*beta*c_0^2

I want to know in which regions this function has positive values and where it is negative. Tried it with the command contourplot, but this is not telling me anything :(.

Hope somebody can help

Thx
 

Hello,

is there any way to solve a system like (d denotes the derivates):

 

f1(x1,x2,y1,y2)=0

f2(x1,x2,y1,y2)=0

dg1(x1,x2,y1,y2)/dy1=0

dg2(x1,x2,y1,y2)/dy2=0

 

Hi there, could someone help me plot zeta(0.5 + it) as seen here - en.wikipedia.org/wiki/File:Zeta_polar.svg

 

I assume I need to import some complex plot package?

This may have an annoyingly simple answer but I cannot seem to plot the prime counting function

with(numtheory):
plot(pi(x), x=0..100);

 

This just gives me an empty plot.  Any ideas?

I am very, very new to Maple and I know practically nothing. I have to create a number line, which I realize I use the plot command and x-axis, but that's about all I know. As an example, my professor gave "plot([[1,0],[5,0]],color=black,thickness=5);

Is it possible to export a Maple animation as a movie that can be inserted elsewhere like a PowerPoint presentation?  I know that I can export a "still frame" from an animation but I would like to export the entire movie.   Thanks.   David

f(x) = (a((ax+b)/(cx-a))+b)/(c((ax+b)/(cx-a))-a)

The homework assignment asked me to simplify this function. It turns out that I was able to simplify it all the way down to f(x) = x by hand. However, I cannot seem to get Maple to simplify it any further than the original problem. Any ideas? Thanks, Brandon

when a student or colleague attaches a .mw file to an e-mail....i have trouble opening it....when i try to i get this question "How do you want to open this text file?" with four options "Maple Text", "Plaintext," "Maple Input" and "Cancel".  it does not matter what I enter here....the worksheet appears empty.

i do not have any problem with .mws files as e-mail attachments.

pwh

Hello,

I am trying to solve numerically the following equation :

Eq:={diff(u(x,t),t$2)-0.1*diff(u(x,t),x$2)+0.00001*diff(u(x,t),x$4)+0.1*diff(u(x,t),t$3)=0};


Here is my code :

restart;with(plots): with(PDEtools):

Eq:={diff(u(x,t),t$2)-0.1*diff(u(x,t),x$2)+0.00001*diff(u(x,t),x$4)+0.1*diff(u(x,t),t$3)=0};

BC:={u(0,t)=0,u(1,t)=0,D[1](u)(0,t)=0,D[1](u)(1,t)=0};

I will really appreciate some help with assigning solutions of the solve command to names. For example, when I enter the command...

solve( [3x + 9y=10,8x-7y=20],[x,y])

 

I get the following output:

 

[[x=250/93, y=20/93]]

 

How can I extract the solutions and assign them to x and y which I want to use in subsequent calculations such as ...

 

sin(x) + sqrt (y)

 

Hi all,

I am solving a system of ODEs numerically, and then plotting the results over time. I would really like Maple to show me the equation behind the plotted graphs. Through my searches I have not been able to find the code for that. Any help would be greatly appreciated. For example, how do I see the equation for W(t)?

sol1a := dsolve([Eq1a, Eq2a, Eq3a, H(0) = 4879, W(0) = 105000, R(0) = 0], numeric, method = rosenbrock, output = listprocedure)

plots[odeplot](sol1a, [t, W(t)], t = 0 .. 40, color = blue, style = point);

Hi!

I have a system of equations like this:

equation

and I wrote this equations into maple in this way:

eqns := [diff(x(t), t) = -x(t)-y(t), diff(y(t), t) = x(t)+.25*y(t)+r(t), diff(z(t), t) = 3+x(t)*z(t), diff(r(t), t) = .5*z(t)+0.5e-1*r]

using DEplot3d I tried to drawing attractor diagram:

plotting...

January 23 2009 massimo 44
0 10
This is my problem: i've an nonlinear system of six equations and i find the solution with Runge-Kutta: for every t>0 i've x[1](t), x[2](t), x[3](t), xc[1](t), xc[2](t), xc[3](t). I write this solution in the vector "solution" > solution:=dsolve(... Yet i've also another equation ("EQ7") of the type: EQ7 = f(xc[1](t),xc[2](t),xc[3]) with xc[1],xc[2],xc[3] presents in &q

Hi, all,

 I checked all the information of Groebner Basis in maple, and I cannot find how to compute Groeber Basis over Galois Field, for example how to computer Groebner Basis over GF(2^4)?

 

Thank you.

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