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[Octave-bug-tracker] [bug #40362] chi2cdf/gamcdf/gammainc bug
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From: |
José Luis García Pallero |
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Subject: |
[Octave-bug-tracker] [bug #40362] chi2cdf/gamcdf/gammainc bug |
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Date: |
Thu, 07 Nov 2013 15:43:05 +0000 |
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User-agent: |
Mozilla/5.0 (X11; Linux i686; rv:24.0) Gecko/20131101 Firefox/24.0 Iceweasel/24.1.0 |
Follow-up Comment #1, bug #40362 (project octave):
I've also found this error, in my case using chi2inv:
>> chi2inv(0.005,1200)
***MESSAGE FROM ROUTINE D9LGIT IN LIBRARY SLATEC.
***FATAL ERROR, PROG ABORTED, TRACEBACK REQUESTED
* NO CONVERGENCE IN 200 TERMS OF CONTINUED FRACTION
* ERROR NUMBER = 3
*
***END OF MESSAGE
***JOB ABORT DUE TO FATAL ERROR.
0 ERROR MESSAGE SUMMARY
LIBRARY SUBROUTINE MESSAGE START NERR LEVEL COUNT
SLATEC D9LGIT NO CONVERGENCE IN 20 3 2 4
error: gammainc: exception encountered in Fortran subroutine xgammainc_
error: called from:
error: /opt/octave/share/octave/3.6.4/m/statistics/distributions/gamcdf.m at
line 58, column 12
error: /opt/octave/share/octave/3.6.4/m/statistics/distributions/gaminv.m at
line 84, column 13
error: /opt/octave/share/octave/3.6.4/m/statistics/distributions/chi2inv.m
at line 47, column 7
I've also found the value of 1200 as the starting bug point. This value is the
same for my two different systems (Pentium M 32 bits and Intel Core i5).
In Matlab, chi2inv works fine regardless the value of the degrees of freedom
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