ARPACK dsband.f

From: arismar (member46585_at_dbforums.com)
Date: 10/31/03

Date: Fri, 31 Oct 2003 13:34:59 -0500

We started to use the ARPACK package with dsband.f subroutine to solve a
eigenvector problem. My first attempt was this matrix:

A= 4.16 -3.12 0.56 -0.10

-3.12 5.03 -0.83 1.18

.56 -0.83 0.76 0.34

-0.10 1.18 0.34 1.18

But It didn't work, I tried to find only the first eigenvalue and
eigenvector for sake of simplicity. Thus I have used the following
parameters:

rvec=.true.

howmny='s'

select= .TRUE.

LDZ=4

LDA=LDZ

LDV=LDZ

SIGMA=1.1

N=4

KL=3

WHICH='LM'

BMAT='G'

NEV=1

TOL=0

NCV=1

INFO=0

LWORKL=NCV**2+8*NCV

Anyway I did not understand:

1- The meaning of LDZ, LDA

2- How to write AB in terms of A. What is AB dimension ?

Thanks very much for your attention.

I hope to heard something from you.

Bye

Arismar

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