This is something simple but I cannot find the answer

Typing in
a:=5;
gives the maple output
                                      a:=5

I have changed a setting somewhere so that Maple doesn't show the assignment

When I type
a:=5;
Maple returns just
 ...

Hi there,

I am plotting flow diagrams of a 2-dimensional system of autonomous 1st order ODEs x'=f(x). I have some free parameters in there, and am analyzing how the flow changes qualitatively when varying these.

To visualise my results I want to do some animations. The Explore command doesn't seem to like the DEplot command, or I am doing something wrong. So I use the animate command, which works fine, although I can only vary a single parameter with it.

Dear Maple-experts,

is there a function which returns the linear parts of an ODE?

So for example for the ODE:

ODE:= diff(x(t),t) + 3*x(t) + diff(x(t),t)*x(t)

which gives

diff(x(t),t) + 3*x(t).

My ODE is so large, that this cannot be done by hand.

Thank you very much,

Peter

I want to calculate  an eigenvector of a jacobian matrix J with fixed parameters from the solution of some equations, but the following code does not work. When I use the command in the last 3rd line, it works well.
But I want Maple to calculate J automatically, what shall I do?

restart;
with(linalg);

F[1] := A-(B+1)*X[1]+X[1]^2*X[2];
F[2] := B*X[1]-X[1]^2*X[2];

J := jacobian([F[1], F[2]], [X[1], X[2]]);

sol := solve({F[1] = 0, F[2...

Hi, I am currently trying to draw a standard airfoil NACA 4412 (http://en.wikipedia.org/wiki/NACA_airfoil). I've put all the equations and defined the parameters.

I don't know what is the problem, probably many Float undefined errors... According to me, it should be simple, but somehow I can't get it right. Any suggestions?

Thanks

Here is the file :  

Substituting Periodic Fourier series expansion equation with standing wave equation

Maple formatting cuts off some of the information/question 
I've included a link to an image of the full question
http://dl.dropbox.com/u/6576402/questions/sub_per_fou_series_expansion.jpg 
and as text file

I would like to know how to program this equation in MAPLE to iterate and derive my results (values of "h") in the form of plots....

I would like someone to take a look at my equation and tell me if its solvable...coz am not able to graduate!!!! :(

Hi there,

Often an expression has more than one output, for example, when simply more solutions exist: sol1, sol2, ...

Then I would get the second solution by %[2]. So far so good.

Anyway sometimes the output is splited in cases, with the { notation. How do I read out a specific case of such a solution?

thx :)

Error, (in LinearAlgebra:-LA_Main:-MatrixInverse) singular matrix

what does this mean?

I have 2 equations that are made up of various powers of 2 different variables. Is there any command to retain only terms of the first order? E.g. no "x^2", "x^{3/2}", etc, just "x"s.

He guys!

I had Maple 11 installed on my Mac, and yesterday upgraded to Maple 15, which was installed in a separate folder. My question is if I now can uninstall Maple 11 from my computer, or will Maple 15 need the files, since it was an upgrade, and no full version?

If I can uninstall it: How do I do it properly? I'm on a Mac with OS X 10.6. Maple 11 is installed in a separate folder in the applications folder. There is no uninstall file however. Is just dragging...

I have just upgraded from Maple 12 to Maple 14.  I opened an old file (Maple 12 format) and when I tried to use display to replot the data - there were capital letters where the fit line should be and the axes were also strange.  Is anyone else having this problem and what should I do about it.  Below is a copy of my info:

with(plots);
[animate, animate3d, animatecurve, arrow, changecoords, 

  complexplot, complexplot3d, conformal, conformal3d, 

I want to assign

D1:=-1/4*int((f*exp(-v*s)*(1+v*s)/v^3),0..infinity);

When I do this, it print f(x), v(x), s(x) in the integral and I don't want that...it should stay as f,v,s. Am I doing something wrong?

Hi,

a very simple problem, but nevertheless I am really struggling with it and would appreciate any help.

10.0/50.0;

This generates the output:  .20000000

However, I need the output in the format 0.20

I've already tried the numeric formatting dialogue but it didn't change anything.

Any hints?

Andrea

test := proc (value)
  local a, i:
  a := [jack, john, will]:
  for i in a do
    assign('i', value):
  end do:
  print(a);
end proc:

test(5);
                       [jack,john,will]

outside of the proc it works like I want it to

a:=[jack,john,will]
for i in a do
  assign('i',5):