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I have a 6x6 matrix that depends on 8 parameters, M(F) (F is an 8-dim array, say...), and I want to compute the eigenvalues of this matrix both at a fixed point F_0 and at some other arbitrary point F'. The problem is that I need to make sure the ordering of the Eigenvalues remains the same at these two points, so that if I'd go continuously from F_0 to F' the eigenvalues would go continuously from Eigenvalues(M(F_0)) to Eigenvalues(M(F')), without any flip in the order of the entries.

Hello,

I always used something different from D when using diagonal matrices. Now I learned I can unprotect D.

However, I got this:

> restart; with(LinearAlgebra);
> unprotect(D);
> D := DiagonalMatrix([2, 3]);
> D.D;D^(2);
Error, invalid 'D' operator

Maple does interpret D as a matrix that he can square, but the exponentional notation can't be used as he sees it as some sort of operator?  Can anyone point out my mistake?

Hi everyone,

One minor question:

what would be the code to extract data in the form of 2-d points from the output of dsolve/numeric... output=Array/array?

say, I have 6-d ODE system and I wnat to extract data in the form of 2-d arrays of number s and then approximate this with some polynomials via Curve Fitting package.

For this I need the data to be represented as -dim matrices  for every variable.

Thanks for any help.

Hey,

I have one function that is consisted of several matrices.. The function is,

R := log(determinant(MCOV))+trace(multiply(SCOV, inverse(MCOV)))-log(det(SCOV))-2+Transpose(SM-TAU-multiply(L,K))&*inverse(MCOV)&*(SM-TAU-multiply (L, K));

where MCOV, SCOV, SM,TAU, L, K are all matrics. In a MCOV and L, there are symbols also..

I have tried to get...

Hey,

I have a set of Matrices of the form [a,b,c,d], now I since the standard = doesnt work with matrices, but I have to instead use verify I wanted to ask how I write a function that returns true or false depending on whether a new matrix is already contained in the set. Or otherwise I want to filter the set so that I only have each matrix once.

Thanks!

everywhere i tried to find out how to solve system of linear equations like A*X=F, whre A is a matrix and X and F are vectors, the solution is X:=linsolve(A, F),

but in maple 14 linsolve doesn't work, so are there any analogues for this linsolve function in maple 14 or maybe another simple way to solve this system?

thanks

I have 3 matrices and I want to generate the group associated does anyone know how to do this without doing it manually?

thanks

M 

How to find with Maple all symmetric matrices of  size 5, whose entries are 0,1, having only strictly positive eigenvalues?