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modreg buggy: uninitialized variable in sinerp.f (PR#302)

2 messages · Thomas Hoffmann, Brian Ripley

Original
Thomas Hoffmann
# 
I had some strange problems with modreg: sometimes functions
hang in an infinite loop, consuming 100% CPU time. Especially
when update()ing models (as in example(ppr)) with sm.method="gcv"
I found that if I repeated the call after I did interrupt the hang,
it ran to completion.

After some lengthy debugging I could track down this problem:

sinerp.f, line 22--24 read:

      wjm3(1)=0d0
      wjm3(2)=0d0
      wjm3(1)=0d0

This leaves wjm3(3) uninitialized. So after changing these lines to

      wjm3(1)=0d0
      wjm3(2)=0d0
      wjm3(3)=0d0

the bug was gone.

Thomas Hoffmann.

--please do not edit the information below--

Version:
 platform = i386-pc-os2_emx
 arch = i386
 os = os2_emx
 system = i386, os2_emx
 status = Release
 major = 0
 minor = 65.1
 year = 1999
 month = October
 day = 07
 language = R

Search Path:
 .GlobalEnv, Autoloads, package:base



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Brian Ripley
#
On Sat, 30 Oct 1999 thoffman@zappa.sax.de wrote:

            

      
      
      
    

        
Thank you very much!  We were aware of occasional problems (but only on
gcc), but had not managed to track them down. In all cases using
-ffloat-store had solved the problem.

I have committed this change for the next release.