When I execute the code below, dsolve returns the trivial solution. If I were to apply the BCs by hand I'd conclude that there is a set of eigenvalues associated with the ODE. Is there a way to have Maple produce the eigenvalue equation automatically, or would you typically apply the BCs by hand to find it?

Y_diffEq:=diff(y(x),x$4)-beta^4*y(x)=0;
Y_BCs:=y(0)=0, (D@@2)(y)(0)=0, y(L)=0, (D@@2)(y)(L)=0;
dsolve({Y_diffEq,Y_BCs},y(x));

 

PS

Is there another way to specify the derivative BC?

 

Thank you
 

Hi, im having trouble with selectremove. Im trying to select R(z)>=0 or if R(z)=0 then Im(z)>0, i tried this:

selectremove ( if z--> R(z)>=0 else R(z)=0 then Im(z)>0 end if , % );

 

but its not working, any help would be much appreciated.

 

Thanks. 

 

 

I've been working on my master's project and am at (at least I hope I've got it) the final stage of making Maple do everything that I want it to. I have the flow chart here which is a little hard to see while looking at the module I have set up.

The difficulty I'm having is getting it to run as a whole. I just do not know what I need to do to get the thing started. The way I have it set up is that each procedure references another until they are done - a loop structure. Which may be more appropriate but I humbly submit it to you.

I do not completely understand the module pieces. I do know that each procedure I have inside of here should work (and if not, that's why it's a master's problem :D)

Thank you again for looking!

 (I know the local and export may not be correct, and sorry for the matrix multiplication looking so ugly here)

Hey there . i am new to this software.. so please help me to plot this: i have two equations: x1+x2=m -3*x1 + 4*x1^3 - 3*x2 + 4*x2^3 = 0 i want to have m on the y-axis . Range for m is 0.4..1 i want to have the curves of both x1 and x2 on x- axis and on the same graph . Both x1 and x2 have a range of 0..1. thanks in advance ..

Hi

I'd like to see the solutions of this system of differential equation with boundary conditions :

 

restart;
with(PDEtools);
EDP := diff(s(z), z) = -.45*i(z)*s(z), diff(i(z), z) = .45*i(z)*s(z)-.2*i(z)-.8*(diff(i(z), z));
IBC := s(100) = 1, (D(i))(100) = 0

 

But, when i do : dsolve({EDP, IBC}, numeric, range = 0 .. 100);

Hi,

I'm using MAPLE 13 on Mac OS X 10.5.8 with a "French keyboard".

densityplot requires an expression or function as its argument. 

Is there any way to trick maple into using a list of points?

 

 

View 16650_Blackjackbetter.mw on MapleNet or Download 16650_Blackjackbetter.mw
View file details

Suppose I set

a:=plot(x^2) or some other complicated expression, but just for simplicity sake

Then I go ahead fill up a worksheet then change the a to b in the same line and alter the expression for variable b (because I didn't want to type out a new line for the variable)

How do I recall what I've set a equal to? 

eval(a,1) - just returns the plot and    print(a,1) - returns PLOT(...),1

I think there's a way but I can't recall.  Can someone point me in the right direction?

When rotating any 3dplot, for axes=boxed, how can I stop the tickmark axes from jumping around to different edges of the box?

 

Can someone give a an example what the choices in tools/options/precision/ Digit Elision or term elision are good for ? The help page is unclear to me:

http://www.maplesoft.com/support/help/Maple/view.aspx?path=worksheet/managing/OptionsDialogPrecision

 

Thanks

Hi (working with maple since yesterday, so question might be elementary) I have an ODE system with functions x(t,k),y(t,k), t is the independent variable, k is a parameter, as well as initial conditions. What I am aiming at is a 3-d plot of the _derivate_ d/dt x(t,k) of the first solution of the system, and t and k as horizontal axes.

i have 3 equations as follows: x1+x2+x3 = m (where m is any constant. it can be taken 1 for finding solution) -3*x1+4*x1^3-3*x2+4*x2^3-3*x3+4*x3^3 = 0 5*x1-20*x1^3+16*x1^5+5*x2-20*x2^3+16*x2^5+5*x3-20*x3^3+16*x3^5 = 0 0

Hello,

this is the first time I am using the command line for Maple.I have a few questions,

1. How do I change my current directory?

I tried with currentdir() but with no success.If my dir is E:\Work ,how do I change it?

2. How to execute a *.mpl?

I tried cmaple.exe <*.mpl> but again no success.

 

I am using Maple13 by the way.

 

Any help is golden.

 

Best regards