first, thank you for reminding me, acer.

2nd, I received a mail that someone posted a new comment, but now I can't find my post, where is it?

3rd, can someone tell me how to ask an old question if no one answers for that question?

thank you in advance.

my old question is here:

http://www.mapleprimes.com/questions/97718-How-To-Plot-A-Trignometric-Equation

Several things are broken on mapleprimes right now, including

- embedded (full) worksheets as displayed 2D Math, etc

- reputation plots for several (if not most) members

- both moderator badge updates

I  Presented problems for the plot "DB magnitude spectrum."
The structure of vector data spec has the following configuration,Float (-infinity), inside.

N := 64;
T := 1;

f := .25;
A := 1;
phi := 0;
n := Vector(N, -> i-1, datatype = complex[8]);

x := cos~(2*Pi*n*f*T);

X := DiscreteTransforms[FourierTransform](x, normalization = none);...

I am trying to use Tables to better organize the layout of my Document mode worksheets. I have noticed two problems thus far.1) When I use the triple exclamation point icon to execute the worksheet, sometimes the code in the Table is skipped. and 2) I put a simple plot command in one cell. The plot showed up in the cell, but the grapgh also showed up twice below the Table. If I only execute the code in the cell, this does not happen. There is no hidden code. If I...

I saw an image yesterday of some math done similar to how one can write on paper, with each new reformulation shown on the next line, with a down-arrow between each such line. In other words, operations and output moving down the sheet rather than along it to the right.

The first thing that came to mind was: can this be done in Maple with context-menus?

Here is an attempt,

    cm_downwards.mw

It would be good I hope to present symbolic-numeric CAE system for framed structures analysis.

It will be available soon as Preview version for enthusiasts

The main features are:

• One calculation act - all analytical dependencies.
• Fast designing process for structural systems in industry, consulting and design companies;
• Fastest parametric analysis of construction. New quality of designing in optimization tasks,...

I would like to set the range for a 3d plot.  For a 2d plot, I understand I can do it at the command line or by setting the axes properties after the plot's been drawn.

If I use plot3d(x*y, x=-10..10, y=-10..10) for example, how can I look at those parts of the surface for which -2 < xy < 2 for example?  I'd be happier with a command line option than a gui option but really anything would do.

many thanks!

Mary

I am trying to see what is in the startupcode file by using the Edit->Startup Code.  I know that somewhere is a command called interface(imaginaryunit=j) because it works when I restart.  I cannot even change anything because it does not show anything in the editor and nothing takes effect.

Ratch

Hello,

With reference to the attached screen grab, the Maple command "algsubs" seems unable to substitute equation (6) into equation (3). I was expecting a result where Iani was expressed in terms of kH and k. What am I doing wrong?

Regards,

Ben

I need maple to perform the following:

"int((1+m^2*(alpha-theta)^2*sin(theta)^2/sin(alpha)^2/alpha^2)^(1/2),theta = 0 .. alpha)"

but maple does not integrate. I have tried assuming that the term inside the square root is positive, with no result. What else can I do?

Hi!

I'm studying submanifolds of (semi)-riemannian and trying to look at some examples with Maple using it's great DifferentialGeometry package. But there's one thing I can't figure out. How can I define a pullbacked tangentbundle along the embedding map? Let me be more specific:

I have a manifold S, a manifold M and a map i: S -> M.

I realize this in Maple with: DGsetup( [...], M ); DGsetup( [...], S); i:=Transformation(S,M,[...]);

There...

Hi there,

I have a de that I have gotten maple to solve using dsolve (y'''+2y''-11y'-12y)=48-28exp(3t). When the solution comes up however, the particular solution is in an odd form: 

(-4*exp(3*t)+(11/28)*exp(6*t)-t*exp(6*t))*exp(-3*t)

+_C1*exp(-4*t)+_C2*exp(-t)+_C3*exp(3*t)

However, the particular solution here contains part of the homogeneous solution inside of it: namely the 11/28exp(3t) term. Is there any way to run a function on my solution...

Is there anyway to get Maple to solve for a limit of integration.  every time I try Maple gives me an error.

Sorry that this may not belong here but I thought I would ask, it is interesting. 

Now I'm not asking for the winning numbers list but rather the numbers chosen by people (the thousands of non winning ticket numbers per game)  Is there a database somewhere we can access that stores the list of picked numbers?  It would be interesting to find out how randomly people pick numbers, do people flock to certain numbers more often than others?

I...

Hi,

I have the following ODE:

dx/dtau=s-rx+x^2/(1+x^2)

Where r,s,x vary over an interval. 0<r<0.5 ; s and x any real value (positive). Our instructor wants us to numerically integrate this. He has a program available on his website but I would like to know how to do this in maple. I have the answers to the question already but I would like to use maple to find the answers. This is for a course in Nonlinear Dynamics and Chaos. I am not very proficient...