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st: spatwmat "matrix not symmetric"


From   Richard Palmer-Jones <rpjstatalist@googlemail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: spatwmat "matrix not symmetric"
Date   Fri, 19 Feb 2010 13:45:57 +0000

Dear readers

I get an error from spatwmat which I cannot explain.

The file is square (455 rows & columns), and has values 0/1 in each row

 des using d:\gis\india\w1991_457_.dta

Contains data
  obs:           455                          19 Feb 2010 13:24
 vars:           455
 size:       829,920
-------------------------------------------------------------------------------

....

. use d:\gis\india\w1991_457_.dta, clear
. egen tot = rsum(r*)

. tab tot

        tot |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          7        1.54        1.54
          2 |         22        4.84        6.37
          3 |         48       10.55       16.92
          4 |         90       19.78       36.70
          5 |         96       21.10       57.80
          6 |         95       20.88       78.68
          7 |         68       14.95       93.63
          8 |         22        4.84       98.46
          9 |          5        1.10       99.56
         10 |          2        0.44      100.00
------------+-----------------------------------
      Total |        455      100.00

      Total |        591      100.00


Yet when I run spatwmat I get an error.

. spatwmat using "d:\gis\india\w1991_457_.dta", name(w1991_contig)
standardize eigenval(E1)
matrix not symmetric

I am using ver 1.0 of spatwmat

c:\ado\plus\s\spatwmat.ado
*! Version 1.0 - 29 January 2001 STB-60 sg162
*! -spatwmat- Generates different kinds of spatial weights
matrices
*! Author: Maurizio
Pisati
*! Department of Sociology and Social
Research
*! University of Milano Bicocca
(Italy)
*! maurizio.pisati@galactica.it

*!


.

Thanks for your help

Richard
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