## How to solve a boundary value problem!...

I need to solve following ODE: ODE:= y(f)*(diff(y(f), f, f))+50.0*f -50.0*f^2= 0 Subject to boundary conditions: BC:= (D(y))(.5) = 0, y(0) = 0 I used BVP method : dsol2 := dsolve({ODE, BC}, numeric, method = bvp[midrich], y(f), range = 0 .. .5) But I got " Error, (in dsolve/numeric/bvp) division by zero" Can someone please tell me what I can do. Thanks, http://maplenet.maplesoft.com/maplenet/worksheet/mapleprimes/4384_BVP.mw

## Hoe to solve a boundary value problem...

I need to solve following ODE: ODE:= y(f)*(diff(y(f), f, f))+50.0*f -50.0*f^2= 0 Subject to boundary conditions: BC:= (D(y))(.5) = 0, y(0) = 0 I used BVP method : dsol2 := dsolve({ODE, BC}, numeric, method = bvp[midrich], y(f), range = 0 .. .5) But I got " Error, (in dsolve/numeric/bvp) division by zero" Can someone please tell me what I can do. Thanks, http://maplenet.maplesoft.com/maplenet/worksheet/mapleprimes/4384_BVP.mw

## Eigenvectors for Sparse 50x50 Matrix....

I'm trying to find Eigen vectors and values for 50x50 matrices (and larger) that are very sparse (at least 80-85% zeros). Using the Eigenvectors function [ (v, e) := Eigenvectors(L) ] function is prohibitively slow, but it seems there must be some way to speed things up by taking advantage of the sparse quality of the matrices. Thoughts?

## procedures...

hi, I've got a question: does anybody know how to receive more than one object as an output of procedure? ex. I need to get a plot and print some parameter values or to get more than one plot, but one under another, not using display command. thx.

## how do I install Maple 11? Do I need to uninstall...

Hello, I was wondering if I need to uninstall Maple 10 before I install the upgrade Maple 11. Or afterwards.... Or can I leave Maple 10 on? Thanks a lot, Steve.

## array values...

I'm relatively new to Maple so the answer to this question may be simple. Why do I not get the expected results of 23.30 and 24.40 when displaying the Matrix? The results are the same if I declare it as an Array. ``` myMatrix := Matrix(1 .. 1, 1 .. 2, datatype = float); myMatrix[1, 1] := 23.30; myMatrix[1, 2] := 23.40; print(myMatrix);```                                               [ 23.3000000000000007     23.3999999999999986 ]

## Maple11 and VISTA...

I am considering buyuing a notebook computer and all the ones I have taken a look at come w/ the VISTA OS. As I understand it from certain posts on this forum, if I were to buy one of those notebooks I would not be able to run MAPLE11 on it until some unspecified time in the future. Is my understanding correct? If so, I would hope and expect that the folks at Maplesoft give this matter high priority, inasmuch as it appears that most new computers come w/ VISTA installed.

## Maple - easy talking to DLL...

Something I hadn't tried until today was calling into a DLL with Maple. I was surprised at how easy it is. Once inside a DLL, the sky is pretty much the limit as far as passing the data around between applications for realtime plotting and even passing to device drivers for other processing or even I/O in WinXP.

## querying the 'view' option of a graph...

Is it possible to get/set the view option of a plot component using the DocumentTools package? I'm trying to plot a function containing a parameter whose value is controlled by a slider component. When I adjust the view using rightclick->manipulator->scale and then move the slider, the graph reverts back to the hard-coded scale in the original plot command. I'd like to set a default scale, then allow a user to set the scale using the scale manipulator and have that new scale persist through the next slider manipulation.

## Maple 11: puzzling result from DE solver...

I'm relatively new to Maple and have a question about a result from the menu DE solver. In the attached file, FODE puzzling result #01.mw, I don't understand ln(e)-1 in the denominator. Thanks, Rich View 1292_FODE puzzling result #01.mw on MapleNet or Download 1292_FODE puzzling result #01.mw
View file details

## loop' command...

hi... can anyone help me to give an example of loop's command for programming the random data generator? i have to built programmning for random data that will appear after i've run the experiment,but i have no idea to do that.. please..i've run out the time..

## initial condition over a range for a pde...

This is probably very elementary, but I am a new Maple user (first day) and would appreciate any help. I am using Maple 11. I am trying to solve Laplace's equation in a circle and so have set up the pde in polar coordinates. pde := Diff(u(r, theta), r, r)+(Diff(u(r, theta), r))/r+(Diff(u(r, theta), theta, theta))/r^2 = 0 My problem is that I want to specify initial conditions over a range. i.e. u(r,theta)=1 for r=0.5 to 1 for theta=0 and theta=2*pi, and u(r,theta)=-1 for r=0.5 to 1 for theta=pi. My problem is that I don't know how to specify the condition for a limited part of the r range.