Hi,

I am using Maple 11.02 on win xp sp2 in classical worksheet

I put

restart:

ode:=2*diff(y(x),x$2)-y(x)/x+y(x)^3*cos(x);
 

dsolve(ode,y(x));

maple give me nothing at all  ?? just like I typed  " : " instead of  "  ;   "

why?

Thanks

Hi,

I have been doing some ODEs question and I want to check them with Maple 11Classical Worksheet  in windows xp sp2.

>restart:

>ode:=diff(y(x),x)-y(x)=x*y(x)^5;
 dsolve(ode,y(x));

then the output got 4 answer

I was wondering if there is something to keep it in the form like

y^4 = f(x)  ??

Thanks in advence

Hello, i get the following error each time maple i started:

FlexIm error: -88,309 "System clock has been set back"
Maple asks to reactivate, once done that successfully Maple says that after starting Maple again everything will work properly. But it doesn't work, I get once again the same error and the question to reactivate.

Hello, I have a question concerning a PDE with specific IC/BC, that describes diffusion of a species in a moderately solid thin film with a finite thickness on a solid substrate that is considered semi-infinite. The thin film has an impermeable boundary at x = -h, and the interface between the thin film and the substrate occurs at x=0.  It is possible that the species of interest may be substantially depleted from the substrate, depending on how long the experiment runs.  I am not sure that I have set up the code correctly, and am using Maple 11.

Hello,

how to simplify lhs(eq) to get rhs(eq)?

eq:=y*(sum(a[n]*y^(n-2)*n*(n-1), n = 0 .. infinity)) = (sum(a[n]*y^(n-1)*n*(n-1), n = 0 .. infinity));

is(eq);    

Regards

Jerzy

Hey,

I have an ODE:

diff(x(t),t$2)+epsilon*diff(x(t),t)+x(t)=0

where 0<epsilon<<1

is there a way to plot a phase plane of this?

or I will just have to give epsilon a really really small value to plot that?

thanks in advance

Hey

How would i go about modelling the Least Square Fitting Approach in maple?

I am concentrating on a 3x3 to a 5x5 grid rather than infinate.

the formula is

y = C  + Dt

I know the least fitting approach then goes into inversiting the matrix, or something, but i dont understand the math model which is why i want to model it in Maple.

Thanks for any help

Hello,

I have a problem with the elimination of variables from set of eq.

For example:

I tried:

How would I go about adding points and a function to the same set of axes? For example I have a set of points already plotted, and I want to plot my function, f(x)=x^2 on the same graph to compare them.

Thanks.

To Maplet Experts:
There is dearth of work  on ComboBox, a maplet element.  How does one access an item in a ComboBox.  How does one know which item in the itemlist is selected.  How does one pass selected item as an argument in a function,
I will appreciate any respond to these questions. 
Pat Velez
 

hey,

can someone give me an example of plotting a phase plane without solving the ODE

suppose i got an equation

diff(x(t),t$2)+x(t)=0

without solving it

plot a phase plane (  x dot, x )

thanks in advance

Let's say I have four variables which are assigned with the following values:

A = 10

B = 25

C = 4

D = 6

When I write A*sqrt(B)/(C+D) the Maple output is "5".

I want the output to look like

How can I achieve this?

I just typed an expression, such as

expand((z-6+I)*((5-I)*z+9));

on a line. On the next line, I wish to evaluate this expression at at z = 4+I, say,

without having to retype the expression. How do I do this?

%

simply returns the previous line.

I have to approx how many prime number there are between 2 to 50 000 by using  int(1/ln(t),t=2..50000);

I need to use (to approximate):

a) rectangle method

b) trapezoid method

c) simpsons method

However, I can not use the fonction like simpson(1/ln(t),t=2..50000); to solve them, I need to go with the definition and I have no idea how.

Can any1 help me?

ok so i have summed down two plot functions (P1,P2) so then i can plot them together using display, however whenever i try to use display it comes up with display({Plot(...),Plot(...)}), what do i need to do right, or what have i done wrong.