Out of Memory. Exiting.

*To*: mathgroup at smc.vnet.net*Subject*: [mg27267] Out of Memory. Exiting.*From*: "Ivan Stegic" <ivan at stegic.com>*Date*: Sun, 18 Feb 2001 02:52:05 -0500 (EST)*References*: <200102160858.DAA13479@smc.vnet.net> <200102170830.DAA17264@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Hello everyone... I've searched the archives extensively, and found various answers to my problem. However, none of them helped me. I am trying to find the eigenvectors to a 3x3 matrix. I keep running into Out of Memory Exiting problems, whether I run it with the frontend or without. I am running Mathematica 3 on a RedHat Linux 5.1, Kernel 2.0.35 Pentium II 400 with 128MB of RAM. The matrix I have contains 2 variables, and I am trying to solve the for the Eigenvectors symbolically in terms of these variables. The catch is that the variables are trigonometric functions. Following is the command I execute. The result is "Out of Memory. Exiting." What can I do? Could someone else try this on their more powerful machines, or will it still run into the same problem? Or is there a way of simplifying this? Or the matrix? Thanks very much, Ivan. ------------------------ [ivan@apollo ivan]$ more jobs/i.txt Eigenvectors[{{Cos[q]^2 - Cos[2*p]*Sin[q]^2, 1.*(Sin[2*p]*Sin[2.*p]*Sin[q] + Cos[p]^2*Cos[2.*p]*Sin[2*q]), 1.*Cos[2.*p]*Sin[2*p]*Sin[q] - 1.*Cos[p]^2*Sin[2.*p]*Sin[2*q]}, {-(Cos[p]^2*Sin[2*q]), 1.*Cos[q]*Sin[2*p]*Sin[2.*p] - 1.*Cos[2.*p]*(-(Cos[2*p]*Cos[q]^2) + Sin[q]^2), 1.*(Cos[2.*p]*Cos[q]*Sin[2*p] + Sin[2.*p]*(-(Cos[2*p]*Cos[q]^2) + Sin[q]^2))}, {Sin[2*p]*Sin[q], -1.*Cos[2.*p]*Cos[q]*Sin[2*p] + 1.*Cos[2*p]*Sin[2.*p], 1.*(Cos[2*p]*Cos[2.*p] + Cos[q]*Sin[2*p]*Sin[2.*p])}}]>>>EVec-Symb; [ivan@apollo ivan]$ ------------------------ (For those who are interested, this matrix is a rotation matrix that takes the orthonormal basis of a cone rotating around a replica cone from its initial to its final position. p and q are the cone semi-angle, and the parametrized position of the rotated cone respectively.)

**References**:**numerics***From:*Matt.Johnson@autolivasp.com

**Re: numerics***From:*Tomas Garza <tgarza01@prodigy.net.mx>