dsolve(diff(r(t),t$1)=-r(t)*(-1+r(t)^2));

                       1                                  1           
     r(t) = ------------------------, r(t) = - ------------------------

Okay, I have a simple 5 X 5 matrix.  How do I view it as an image?

 

With a very large image 1000 X 1000, I can left click on it and view the matrix in a spreadsheet and then click on a tab that says image and view that matrix as an image.  How do I do that with small maticies?  I can't figure it out.

I have an  ode system, and use  2 D Math  (I don't know how to copy here, so I type by hand)

x'(t) = -y(t) + x(t) (1 - x^2(t)  -  y^2(t)),

y'(t) = x(t) + y(t) (1 - x^2(t) - y^2(t)).

I would like to introduce  x(t) = r(t) cos(Theta(t)), y(t) = r(t) sin(Theta(t)) and manipulate the equations further.

The problem is the left hand side. In one case I obtain Dx(t), in the other case (r(t) cos(Theta(t))' without calculation on it.

I ask some help. Thanks.

Hi guys

 

How can i construct the standard vector e[i]. Where e[i] is a 4 dimensional vector with 0 in all entries apart from the ith which has ?

Hello there, Would appreciate if someone could illustrate the procedure to obtain, using the plot3d command, simply the solid bound by the given set of graphs. In other words, all superfluous areas are substracted. For example, for the cone z=sqrt(x^2 + y^2) & planes z=2 & z=4, I'd like to see just the solid bound by the planes and not what appears when the following commands are executed: a:=implicitplot3d(z = sqrt(x^2+y^2), x = -5 .. 5, y = -5 .. 5, z = -5 .. 5); b:=implicitplot3d(z = 2, x = -5 .. 5, y = -5 .. 5, z = -5 .. 5);

Another interesting undocumented package in the Maple 11.02 Library.

Hi Guys, i have a forloop problem.

I have a nxs matrix, where s=sum((k),k=1..n-1), so when n=3, s=3, when n=4,s=6 and so on.

I need to code each column number lexicographically for cartesian pair (i,j) where i<j, so when n=3, the columns would be

 

(1,2),(1,3),(2,3)

and when n=4 we have

(1,2),(1,3),(1,4),(2,3),(2,4),(3,4)

.

Is there a spherical harmonics package available anywhere ?

 

I may have to start using vector spherical harmonics and don't really feel like fighting with Maple, and the Legendre and Associated Legendre functions on my own.

 

v/r,

 

My oldest son, Stuart, recently completed a Science Fair project on sudoku puzzles. While I am fairly good at solving sudoku puzzles, the mathematics is something that is completely outside my area of expertise. After seeing the paper by Hurzberg and Murty in the Notices of the AMS (June/July 2007) and additional papers by Felgenhauer and Jarvis (http://www.afjarvis.staff.shef.ac.uk/maths/felgenhauer_jarvis_spec1.pdf)  and Russell and Jarvis (http://www.afjarvis.staff.shef.ac.uk/maths/russell_jarvis_spec2.pdf) and Jarvis' sudoku webpage (http://www.afjarvis.staff.shef.ac.uk/sudoku/), I felt that I had a reasonable understanding of some of the basic ideas involved in counting unique sudoku puzzles. While I had nothing to add to the mathematical ideas, I did see the potential to create a tool to visualize these ideas. The result is the worksheet I just uploaded to MaplePrimes:

View 178_Sudoku3-20-03-08.mw on MapleNet or Download 178_Sudoku3-20-03-08.mw
View file details

Hello, I have a question regarding the behavior of the numeric event division_by_zero. The documentation of ?event says that "A division of a non-0 number by 0 should signal a division_by_zero event. The default action is to return a correctly signed infinity, if possible, and otherwise an undefined. This event is also properly signaled when an attempt is made to evaluate a function at an infinite singularity, e.g., ln(0)." Yet, when using the default settings, I get the following output: > NumericEventHandler( division_by_zero = default ): > 1/0;

I been trying to make a Maplet that will solve some numerical analysis problems, those problems or indeen the solution of them are composed of iterations.

I would like to show such value iterations on a table in a Maplet interface, with no success.

for my logic, this should work.

Set('Table1',[[1,2],[3,4],[3,4]])

But I get an error telling me that the value is not settable.

It doesn't make sense to me to have a control that I can't modify its contents at runtime?

Any ideas about how to do this?

 

Thanks

Hey,

I am doing some ODEs and I met the following problem...

 

The original problem is

 

y(x)*(y(x)-2*x)*diff(y(x),x)=1;

 

and knowing the solutions contains efr function.

 

After several lines of calculation I got

Int(y^2*exp(1)^(y^2),y);

 

 

then maple gives me the answer

 

1/2*y*exp(y^2)+1/4*I*Pi^(1/2)*erf(y*I)

 

Hey

 

Can someone have a look at this

 

restart:

int(-m*(m-2)/(-1+m^3-2*m^2),m);

 

maple gives me

 

-sum(_R*(_R-2)/(3*_R^2-4*_R)*ln(m-_R),_R = RootOf(-1+_Z^3-2*_Z^2))

 

what dose this imply?

 

Thanks in advance

Hey

I have gone through all the maple videos that are linked to from the Maple Software, and was just wondering if anyone knows of any other places on the net where i can get maple videos, for free or paid?

I have learnt ten times more watching the videos than i did when using a book.

I still get stuck, but then i just come on here and ask.

 

Thanks All

Hello,

I am trying to get Maple to help me solve an integral equation.  I tried the solve command, which I suspected wouldn't work.  I was right, but I do not know how else to approach the problem.  Here is what I did:

 

solve(int(f(t), t = 1 .. x) = 5*x^2+7*x-3, f(t))

 

Of course this produced an error.  Any suggestions?  Thank you.