Hello,

I am using the LinearAlgebra package, and I am dealing with very big square matrices (almost a hundred rows and columns).  They have a lot of eigenvalues, with high multiplicity.  

I am performing operations on the eigenspaces.  So what I would need is a matrix with as columns a basis with eigenvectors for a very specific eigenvalue.

I can of course use SubMatrix(Eigenvectors[2],....) but that would take ages and Eigenvectors gives the eigenvalues in an ever changing order.

Hi all,

I just recently started using maple to supplement my math work. When I was just trying some random equations and graphing them, I tried to plot some 3D graphs. When I tried a simple equation, x+y from -2..2, I recieved this image. http://picasaweb.google.com/lh/photo/wnW4UIkdJck46smuTAnb4Q?feat=directlink

I have worked non-stop every day for the past 3 months on a massively difficult generalization of Bell polynomials.  Sufficiently complex examples on Maple might help me to visualize the general case. One published math paper in particular has helped me tremendously.

Recently I came across a page that was working with ifactor and it seems op now handles the operations a bit different now. 

ifactor(3^43+1);

       (2) (82064241848634269407)

a:=op(2,%):

ifactor(3^41+1);

       (2)(270547105429567)(33703)

b:=op(2,%):

c:=a*b;

     (82064241848634269407) (271547105429567)

I am using fsolve in maple 13 to find the crossing of a pair of implicitly defined functions in a triangular region.  I have been  using the startpoint option, but sometimes fsolve wanders out of bounds.  I have tried specifying the range as {x=0..1, y = 0..x}, but fsolve complains of an invalid range.  Any suggestions?

Thanks!

Michael

Maple experts,

(I am using Maple10)

I have the following system of equations, but I cannot obtain the solution. (I am able to solve by hand, but I want to verify and to solve the same sorte of equation but with more variables).

solve(    {z1s- p*y1s-(1-p)*y1=0, z2s- p*y2s-(1-p)*y2=0, z3s- p*y3s -(1-p)*y3= 0, y1s+y2s+y3s=1,   y1s-thetas1*(1- z1s-z2s) -(1-thetas1)*z1s=0 } , [y1s]);

What is my mistake?

Thanks in advance for the help.

Gabriel

Pretty simple --- in Maple 13, I try plot(x^2, view = 1.995..2.005,3.99..4.01) and I get the below.  Any idea what's going on?

Just wondering if the Maplesoft website will be redesigned ( I hope not ) and what happens to Mapleprimes ( I believe there are some minor changes coming to the way the forums are set up ). 

Will Maplesoft personelle continue to live and work at the site in Waterloo?  or will that building be vacated and a new headquaters set up in Japan?

I use Maple 10 to calculate eigenvalues and eigenvectors:

K:=Matrix(n,n,datatype=float,storage=sparse):
M:=Matrix(n,n,datatype=float,shape=diagonal):
# code to assign the non-zero elements of K and M
(lambda,v):=Eigenvectors(K,M):
 

For n>1000 the calculation takes several minutes (on 2.4 GHz processor, 2 GB RAM). Maple calculates all eigenvalues, but I only need the ten smallest eigenvalues (and the corresponding eigenvectors). Is there a way to increase the speed of the calculation?

Hi

I have a very simple problem. How to create custum component similrar to real expresion block (this block doesn't accept piecewise function) who generates piecewice function f:=x->piecewise(x<=2,0,x>=2 and x<=6,exp(-2x),x>=6,0) on output and nothing on input. When I modificate algebraic equtation template and input piecewise function there is an eror who doesn't accept the syntax for piecewise.

I need to use a function that transform a 3 coordonates point (x,y,z) into a 2 coordonates point (x,y) on a specified projection plane, which I called fg. I have the function, but I need to apply it to over a thousand points. Is there a more efficient way than what I did below to do so?

Help creating audio file from Array tia sal22

Greetings All
 
I have a text file with two columns the 1st column which goes from 0 to 1 
represents time in seconds, the 2nd column which goes from 0 to 0.9 represents amplitude.

 I would like to create a wave file from the data and export it to a stereo file at 44100 (cd quality).  How can I go about doing this?  I looked up the maple audio tools and they don't have a place to use the x (time) values they only want the y (Amplitude) values. 

Hello!

I am a beginner of maple.

I try to solve a series of equations sets  with 5  unknown parameters, T, x1,x2,y1,y2

I use fsolve to get the solutions(with 7000 series of solution T,x1,x2,y1,y2). But I found the sequence of the solution is totally disordered.