Hi,

I'm trying to solve a nonlinear diff. equation numerically using (dsolve) but it gives me an

Error, (in dsolve/numeric/bvp) initial Newton iteration is not converging

my code is:

ode:= diff(f(x),x,x,x)+f(x)*diff(f(x),x,x)+B(1-(diff(f(x),x))^2=0   # f'''+f*f''+B(1-(f')2)=0

bcs:= f(0)=0,diff(f(x),x)(0)=0,diff(f(x),x)(5)=1                            # f(0)=0, f'(0)=0,f'(5)=1

Patch request - Patch work on bugs for Maple ceases when a new version of Maple nears release, possibly months before the actual release.  I think it's safe to say no work will ever be done to patch up older versions.  But how can we, the user, introduce our own fix code into maple?  Because we can't fix the built in code how can we temporarily or permanantly make our own patches?

For example prior to Maple 14 a bug exists in a ' for - in ' loop. ...

I have been watching a demonstration on youtube about LP and Interior Point Methods:

http://www.youtube.com/watch?v=MsgpSl5JRbI

He is solving a LP by using a barrier function and has a very nice simulation
in the end where the solution converges to he optimal point and mu goes to zero.
I tried to replicate it in Maple but I am strugeling.
I have attached an worksheet what I have done so far:

Hi,

I'm using solve and I want all the solutions within a certain value, but then within my procedure i'm looking to get a list of just the solutions by using the AllSolutions=true command I get:

a:=evalf(solve([sin(x) = 0.5, 0 < x, x < 10], x, AllSolutions=true,Explicit=true));
 {x = 0.5235987758}, {x = 6.806784084}, {x = 2.617993879}, {x = 8.901179187}

I then need to put them into a list [0.5235987758, 6.806784084,...]

so i either...

25_04_2011.zip

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Hi Guys!

I need your help!

I made a maplet which contains an image in a label. Well, I would like to change this image when i click a button.
But it doesn't work. :S and already i have no ide! Please help me!! 

I have a question: how can I interpolate a 3-d data (x,y-variables vectors; z-function vector)  ang get a new interpolated function explicit polynom?

Thanks in advance! 

Hi. I need to plot a discrete set of points. I have the function, but the assignment is to print the points. I cannot figure out how to plot them correctly (yes, I've been reading the help). The points are created as values from functions and stored in arrays(?) (or, what I think Maple calls arrays), like this:

a := proc (t) options operator, arrow; (-1)*.12*t^4+12*t^3-380*t^2+4100*t+220 end proc
v := proc (t) options operator, arrow; (-1)*.48*t^3+36*t^2-760*t+4100 end proc

One useful feature of the `evalf` command is that it remembers previous results. But it also stores the current value of Digits as well as its input argument, to be associated with the remembered result.

There are two reasons for this. The fancier reason is so that, when Digits is reduced from that of an earlier successful computation, `evalf` can simply round off the earlier result to the desired number of decimal digits. The more basic reason is that `evalf` might...

In part due to a large number of requests on MaplePrimes, the command ?plottools,getdata was added to Maple 15. This new command gives programmers a better way to access the internals of plots and do things with the data they contain.

I was trying to come up with something really fun to do with this command, and another recent obsession came to mind: the game Minecraft.  Minecraft is nice, since like Maple it is written in Java and runs on lots of platforms!  For the uninitiated, Minecraft is a a sort of mostly unstructured "sandbox" game. The player starts in alone in a procedurally generated landscape consisting of blocks. They player can collect blocks with their hands or with tools and they use them to build new things. The wide array of things that people create in Minecraft is staggering.

So, I thought I would write some commands to export 3D plots in Maple to block structures in Minecraft.

How many times does the the sign of the product cos(x)*cos(x/2)*cos(x/3)*...*cos(x/2011) change when x passes from 0 to 2011*Pi/2?

Why is the max height always 0 in this code? Thanks.

>restart;

>a := proc (t) options operator, arrow; (-1)*.12*t^4+12*t^3-380*t^2+4100*t+220 end proc

printf("%10.10s    %15.15s\n", "Time (hrs)", "Height (meters)");

printf("%10.10s    %15.15s\n", "----------", "---------------");

amax := 0; tmax := 0;

for t to 4 do

alt := a(t);

printf("%6d        %10.0f\n", t, alt...

Hi!

> define( f , diff( f(x,y) , x ) = f1x(x,y) , diff( f(x,y) , y ) = f1y(x,y) );

produces

> diff( f(x,y) , x );
0

> diff( f(x,y) , y );
0

> diff( f(x,x) , x );
f1y(x,x)

So how can I do it correctly?

There are two data txt files:x0-y0.txt and x1-y1.txt,every one has two columns.
So, two functions can be made from the data,named y0=y0(x0) and y1=y1(x1).
I just want (y0-y1)/y0 at the same x coordinate.
Because it's too difficult to get it directly,I choose the curve fit method.
First,I used the command CurveFitting[ThieleInterpolation] to get two functions.
And then pointplot the (y0-y1)/y0 at the same x0 coordinate.
Surprisingly,the plot is discontinued.

Hello Friends,

I have the equation