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?

 

 

 

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.

I am working with matrices in maple, and just have a couple questions.

a) how do you make a matrix value "symbolic", and what does this mean (ie: i have a variable "j" in one of the matrices that I need to make symbolic).

b) when I go to do simple matrix arithmatic, and it doesn't compute, I get long errors.  How should I go about cleaning up these errors for the final document that I am creating?  Also, when do you need to call on the "linear algebra" code/package, and how do you go about doing this?

Thanks

Hey,

I am trying to solve a polynomial function for which there should be two solutions for x (it is just a standard x^2 +ax +a type equation, but I am a complete newb to maple and can only seem to get one solution for x.  Can you please tell me exactly what I need to enter to get all solutions for x.

 

Thanks

Hey,

I am trying to make a 3D plot of the following, but when I enter it, I am only getting the option to do a 2D Implicit plot for some reason.  Can you please tell me exactly what I need to enter, so I can make a 3D plot?

G(x, y) = e^(sinx) * cos(y)sin(xy)

Thanks...

I have a differential equations system with initial condition which contains complex numbers, but there is an error which says "dsolve/numeric can not solve with complex number the system must be converted to real system".

What should I do? how do I solve a differential equations system with complex initial values with maple?

Thanks....

<p>Good Morning Everybody,</p>
<p>I'm wondering what is wrong with the Maple code below, the worksheet works but Maple could not read L[1], L[2], L[3], and L[4] from the list param to give numerical solution. Would anyone be kind to tell me what is wrong with the code.</p>
<p>Regards,</p>
<p>restart:</p>
<p>n :=4</p>
<p> > n := 4;<br />
print(??); # input placeholder</p>

I am trying to build a portfolio optimization model from simulated data. I start by defining the very large

correlation matrix and then I apply Cholesky decomp to get the cross correlated simulated data. However

I systematically get the warning message:  Warning, Matrix is not positive-definite. It is extremely difficult

(if possible at all) to specify a large correlation matrix that is positive-definite.

 

Hi all,

I need to obtain the partial derivative of the following functional, with respect to "a" and "b":

for example, diff(p(a(t),b(t)), a) or diff(p(a(t),b(t)), b)

I am using Maple 12, but it returns 0 while using the above command. Does anybody know how to enter the correct commands?

Thank you in advance,

Saeid

 

Hello all,

 

I've been trying to recreate a simulation from a textbook, and the system of equations needs starting values to solve correctly. I've supplied all of the information that another program uses, and the degrees of freedom make sense, and I can even solve it with fsolve. However, as I try to supply the starting_values to the fsolve, I get the error "fsolve cannot solve on starting_values(...". Any help appreciated. I'm attaching the file...

 

Thanks in advance,

 

Fred

 

I am trying to learn to love Maple's document mode... I would like to be able to display a matrix formula or equation without evaluating it. One way to do this is with the following commands:

  with(LinearAlgebra): `print/&.` := proc (l, r) l.r end proc
  pq := <<-P^2, -P*Q+c>|< P*Q+c, Q^2>>
  2*<g.P, g.Q> = pq &. <alpha, beta>

(Paste them into a worksheet in document mode and press Enter to execute one at a time.)

Hello, the equation I have is of the 4th order and rather long. If i assign values to four of the five parameters then maple gives me four numerical solutions. however if i try to solve analytically with at least two or more parameters then maple cannot find the roots.

is there a way around this?

thank you

 

Is it possible to type special characters such as Newton notation for derivatives i.e. x with one or more dots above it - or X with a bar above it to signify 'mean' in statistics etc. I want to be able to use these to print text-book quality documents. Are these characters available as maths input?