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Hi

 

I have a problem with an assigment for a Marine Construction claass:

Solving the non-dimensional vibration equation numerically (Eq. 2.1). To this end, implement the following transformation:

Z = dX/dT

Eq 2.1: diff(X(T), T, T)+a*(diff(X(T), T))+b*X(T) = C*(1-(diff(X(T), T)))*abs(1-(diff(X(T), T)))*sin(W*T)

 

I've tried to do the following:

 

> dsolve(diff(X(T), T, T)+a*(diff(X(T), T...

Hi

I'm trying to debug my module, but cannot find the problem! The problem areas are marked with red. Can you help?

Modul.mw

 

I want to do numerical differentiation and integration on a large data set.

How can I do?

I'm trying to plot some expressions the contain infinite summations.  On some of them it is working, but is really slow, and on others Maple keeps thinking and consuming more memory until it reaches just under 2 gb, by which time it is pretty much hung.

Is there a way make Maple not work so hard in evaluating the summations?

It looks like for me using shift+tab does not work in linux when one selects 1D as the default input notation and is typing in a worksheet. 

Does anyone know where we should submit bug reports for things like this?


thanks.

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

I tried pairs of x and y:

> with(CurveFitting);


> points:=[[2.612499,16.24096]],[3.437499,14.21687],[3.437499,11.22891],[3.437499,8.192769],[4.262499,6.361444],[5.224999,7.662649]];

> h := PolynomialInterpolation(points, x);

I got

Error, (in CurveFitting:-PolynomialInterpolation) data points not in recognizable format

I also tried

> points := [0, 1], [1, 2], [3, -7], [4, -3];
    ...

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...

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

Hi guys

I've got a Jacobian matrix defined in my maple code to be:

m1

The matrix consists of expressions involving the variables R,X,Y,Z,t where R:=(X2+Y2+Z2)0.5

 

I wish to evaluate the matrix for X=1, Y=1, Z=1, t=1ONLY. but I want to leave R alone. I've tried using the code:

eval(m1,{X=1,Y=1,Z=1,t=1}):

but Maple evaluates it for all the vaiables including R.

Is...

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?

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