RPN Program for Eigenvalues? « Next Oldest | Next Newest »

 ▼ Ángel Martin Posting Freak Posts: 1,253 Threads: 117 Joined: Nov 2005 03-23-2004, 07:50 AM Hello Math-heads, I've been looking for an RPN program that calculates all the Eigenvalues for a generic case, NxN square matrix. Tthat is to say not limited to 3x3, or 4x4, etc. I'd appreciate your hints if you know of such a program being available somewhere. BTW, the program below will solve for real eigenvalues, but of course won't find complex values, nor there's a fool-proof method (depends on initial guesses, etc. It is nevertheless an interesting example of the power of the advantage matrix functions, combined with solve. LBL "*VP" STO 00 "IDN" XROM "MIDN" RCL 00 "X" MAT* "IDN,AA,IDN" MAT- "IDN" MDET RTN LBL "EIGEN" "DIM=?" PROMPT "AA" MATDIM XROM "IMR" DIM? "IDN" MATDIM E ENTER^ 50 "*VP" SOLVE "VP=" ARCL X AVIEW END ▼ Bill Holes Junior Member Posts: 15 Threads: 2 Joined: Jan 1970 03-23-2004, 09:35 AM PPC-TN V1N3 Oct. 1980 may help a bit. A 214 step RPN program to compute all eigenvalues of a real symmetic matrix up to 22 x 22 using Jacobi's method is listed on page 12. I believe it was submitted by Valentin Albillo. ▼ Ángel Martin Posting Freak Posts: 1,253 Threads: 117 Joined: Nov 2005 03-23-2004, 10:22 AM Bill, right on the money! Thanks so much.

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