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Re: PSPP-BUG: moments_calculate error
From: |
John Darrington |
Subject: |
Re: PSPP-BUG: moments_calculate error |
Date: |
Sat, 15 Dec 2012 17:01:35 +0100 |
User-agent: |
Mutt/1.5.20 (2009-06-14) |
I had a look at this one.
The pertinent assertion is:
/* After the second pass we can calculate any stat. We
don't support "online" computation during the second
pass, so As a simple self-check, the total weight for
the passes must agree. */
assert (m->w1 == m->w2);
and when I ran it through gdb, I see:
Breakpoint 1, moments_calculate (m=0x81430c0, weight=0xbffff1c0,
mean=0xbffff1b8, variance=0xbffff1b0, skewness=0xbffff1a8,
kurtosis=0xbffff1a0) at /home/john/pspp-master/src/math/moments.c:233
233 assert (m->w1 == m->w2);
(gdb) print m
$2 = {max_moment = MOMENT_KURTOSIS, pass = 2, w1 = 2257.1583655975705, sum =
970999467.71251988, mean = 430186.6818527166,
w2 = 2257.1583655975778, d1 = 6.8955123424530029e-06, d2 = 1504554313897766,
d3 = 2.7440683550398496e+21,
d4 = 9.0176522508330139e+27}
So it would appear that this is simply a floating point precision problem
(which inevitably arises when doing
equality comparisons with floating points). So I suggest that this assertion
be deleted.
J'
On Sat, Dec 15, 2012 at 01:39:27PM +0100, Zolt?n F?bi?n wrote:
Dear PSPP developers,
I have got the following error message when I run the attached
syntax on my pspp sav (attached in the zip file too).
address@hidden:~/pspp_report$ pspp jov2012_report.sps -o output_report.html
Sat Dec 15 13:26:14 CET 2012
pspp: src/math/moments.c:233: moments_calculate: Assertion `m->w1
== m->w2' failed.
******************************************************
You have discovered a bug in PSPP. Please report this
to address@hidden Please include this entire
message, *plus* several lines of output just above it.
For the best chance at having the bug fixed, also
include the syntax file that triggered it and a sample
of any data file used for input.
proximate cause: Assertion Failure/Abort
version: GNU pspp 0.7.9 (Tue Mar 27 21:08:23 UTC 2012).
host_system: x86_64-pc-linux-gnu
build_system: x86_64-pc-linux-gnu
locale_dir: /usr/share/locale
compiler version: 4.6.3
******************************************************
Aborted (core dumped)
Obviously, the error related to sample weight (htesuly). When
weight is OFF, than no error occurs. Should there be need for
more info, please let me know.
Best regards,
Zoltan Fabian
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