Hello all,

I just recently got Maple 15 re-installed for my Chaos Theory class, and am having a bit of difficulty remembering how to plot iteration functions..

An iteration function, obviously, is one where the calculated values depend on the previous (or initial if it is the first plotted) values.

Where the general form of the equation I want takes:

X_n+1 = k - (X

Dear All,

maplehelp.mw

I am trying to solve the equation shown in the attached file but can't get the required answer, any suggestions?

I shall be very thankful.

Regards

A.Q

A(n,q) = I(n)*Z(q)/2 * Sum((cos(nwt - qptheta - (n-q)(i-1)2*Pi/3)+cos(nwt + qptheta - (n+q)(i-1)2*Pi/3)),i=1..3)

With n - q = ...-9,-6,-3,0,3,6,9   above equation becomes

I have written a procedure that creates lists of numbers (for later plotting, but that is irrelevant here). These lists I have programmed as 1-d rtables (Vectors and Arrays). Since I do not know initially how many entries the procedure will generate I am using programmer indexing (with round braces) so the Arrays and Vectors get extended as needed, 1 entry at a time. Basically; I dynamically allocate storage in this way. Maybe not the most efficient way but should work for now.

Hello, everyone.

How to plot 

plot(-(2*(e-1))*exp(-3*x)/exp(-3)+(3*e-2)*exp(-3*x)*x/exp(-3)) 

this function is the answer of ODE: 

ode1c := diff(f(x), x, x)+6*(diff(f(x), x))+9*f(x)

ics := f(1) = exp(1), (D(f))(1) = -2

I got a warnning : "

Warning, unable to evaluate the function to numeric values in the region; see the plotting command's help page to ensure the calling sequence is correct

Here is a possibly stupid one: I have written a couple of help files for a package I am developing. As things go; I want to update one. In the help system it tells me to edit the .mw file that i used to write the page in the first place, which I did. But then I am supposed to "Save to Database" from the Help menu.

But... there is no entry to "Save to Database..." in any menu; help or otherwise. Not even in the help system. So I am stuck with an edited help page that I cannot get to ...

I am traying to perform the followig operation:

For a giving vector A, where A=[1,3,5]  (defined as A=([1,3,5],datatype = float), calculate a vector B where:

B=[10^1,10^3,10^5].

I tried to use a for cicle to calculate B:

for i from 1 by 1 to 3 do  B[i] := 10^A[i] end do

The problem is that i dont get a Vectr B but 3 different number with the name B[1],B[2],B[3]. Just B is not defined.

Hi,

I am trying to fit data to a function. I used the funtion Fit() but the results werent right. This is what i did:

T := Vector([600, 800, 1000, 1200, 1400, 1600, 1800, 2000, 2200, 2400], datatype = float)

Kpco2F := Vector([1.22179966016487*10^20, 8.12830516164100*10^13, 1.66341265037017*10^10, 5.80764417521312*10^7, 1.03276140576140*10^6, 50815.9442560561, 4931.73803954936, 765.596606911256, 168.267406107047, 47.7529273657691], datatype = float)

how can i specify (range and domain) of a function in the softwere,please answere if you are able to.

Hi,

I have an inverse kinematics model for a double inverted pendulum. There are multiple solutions for each joint angles due to symmetry and I have to choose the appropriate ones. I thought I can use the previous choices and compare them with the current multiple solutions, so I could choose the ones which are closer to the previous ones. However, since the double inverted pendulum moves in in both region at the equilibrium, this aproach does not work. Could you advise...

I have a somewhat time-consuming numerical integration which is needed for many different parameters so I'd like to parallelize the various integrations. Threads:-Seq should be just the ticket for this; so I write:

respr128:=[Threads:-Seq(evalf(Int(S(ener,Ecrit)*rangeexp(amp,depth/4,t0[128]),ener=0.001..10*Ecrit,method=_d01ajc,epsilon=1.0e-5)),depth=1..36)];

The functions S and rangeexp are defined thus:

S:=(omega,omega_c)->(9*sqrt(3)/(8*Pi)*omega/omega_c...

Hi,

I wrote a procedure and saved it into a .mla library, then accidentally lost the file containing the initial code. Can I get it back from the library ? I didn't find the answer in the help on LibraryTools.

Thank you.

When I input the following commands in a fresh document

with(VectorCalculus):

SetCoordinates(cartesian_x,y,z)

cartesian_x,y,z   (1)

Del(xy)

0e_x   (2)

I get <0,0,0> when the answer is obviously <y,x,0>. What's going on?

Hi,
I need to solve a big linear system (sparse, if it helps). I first used the "Matrices" and it worked perfectly, but then the matrix got bigger and I got the message "assigning to a long list, please use Arrays". So I learned how to manipulate Arrays and basically wrote the whole program again, but I couldn´t find how to solve A.X=B when A and B are Arrays. And it seems like nobody talks about that on the internet :( please don´t tell me that in 2012, with...

In the LinearAlgebra packet, I use the command MatrixFunction to calculate a function with respect to a matrix J as follow:

> restart; with(LinearAlgebra);

> J := Matrix(3, 3, {(1, 1) = 2, (1, 2) = 1, (1, 3) = 0, (2, 1) = 0,
 (2, 2) = 2, (2, 3) = 1, (3, 1) = 0, (3, 2) = 0, (3, 3) = 2});

> M := MatrixFunction(J, ln(1+x), x);

Then I got the answer:

Matrix(3, 3, {(1, 1) = ln(3), (1, 2) = 1/3, (1, 3) = -1/18, (2, 1) = 0, (2, 2) = ln(3...