matrix singular to machine precision, rcond = nan

[Muthiah Annamalai]

Hello there,

While clearing the Octave-help list messages I accidentally

deleted this persons mail, resulting which Im reposting it.

Sorry for the trouble.

-Muthu

 

From:MOUNIER Stephane,  address@hidden

Hi,    I use octave (version 2.9.5 on FC5) on several computer and I encounter   the following problem :  I have two matrix (in attach):   R =        1.4364e-03   -2.0151e-02   -3.6360e-02   -3.8176e+01   -7.6175e+02     -3.8178e+03   -4.6178e+03  and  T =       2.8900e+00   0.0000e+00   0.0000e+00   0.0000e+00   0.0000e+00     0.0000e+00   1.8900e+00     0.0000e+00   1.0976e+02   0.0000e+00   0.0000e+00   0.0000e+00     0.0000e+00   1.0876e+02     0.0000e+00   0.0000e+00   1.9000e+02   0.0000e+00  
 0.0000e+00     0.0000e+00   1.8900e+02     0.0000e+00   0.0000e+00   0.0000e+00   1.8900e+05   0.0000e+00     0.0000e+00   1.8900e+05     0.0000e+00   0.0000e+00   0.0000e+00   0.0000e+00   3.7710e+06     0.0000e+00   3.7710e+06     0.0000e+00   0.0000e+00   0.0000e+00   0.0000e+00   0.0000e+00     1.8900e+07   1.8900e+07     2.0200e-01   1.1624e+01   2.0200e+01   2.0200e+04   4.0304e+05     2.0200e+06   2.4433e+06    I want to make this operation : R/T    When I use the computer 1 the program run normally with warning, but   when I use the computer 2 the program hang with the following message :    warning: matrix singular to machine precision, rcond = nan  warning: attempting to find minimum norm solution    I try to find why in the FAQ but I did not succes.    Does anyboby can help me to solve this enigma ?    S. Mounier

# Created by Octave 2.9.5, Wed May 24 17:24:03 2006 CEST   <address@hidden>  # name: R  # type: matrix  # rows: 1  #
 columns: 7   0.00143642202020202 -0.020150943907456 -0.0363597979797981   -38.1761817979799 -761.749428406801 -3817.79818179799 -4617.7888089691

 

# Created by Octave 2.9.5, Wed May 24 17:23:37 2006 CEST   <address@hidden>  # name: T  # type: matrix  # rows: 7  # columns: 7   2.89 0 0 0 0 0 1.89   0 109.758148156723 0 0 0 0 108.758148156723   0 0 190 0 0 0 189   0 0 0 189001 0 0 189000   0 0 0 0 3771046.7752912 0 3771045.7752912   0 0 0 0 0 18900001.0000001 18900000.0000001   0.202 11.6238867342106 20.2 20200 403042.987623715 2020000.00000001   2443276.01351046

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