From zeileis@ci.tuwien.ac.at  Thu Jan 11 21:49:51 2001
From: zeileis@ci.tuwien.ac.at (zeileis@ci.tuwien.ac.at)
Date: Thu, 11 Jan 2001 22:49:51 +0100 (MET)
Subject: [Rd] segmentation fault in integrate (PR#812)
Message-ID: <200101112149.WAA26997@pubhealth.ku.dk>

I tried to integrate numerically a function wich is similar to the
following:

> dummy <- function(x) { exp(-1*x) * dnorm(x) }
> dummy(-100)
[1] 0
> dummy(-1000)
[1] NaN
> dummy(-10000)
[1] NaN

If I choose the lower boundary to be too small integrate causes a
segmentation fault:

> library(integrate)
> integrate(dummy, -100, 0)$value
[1] 1.387143
> integrate(dummy, -1000, 0)$value
[1] NaN
Warning message:
Ifail=1, maxpts was too small. Check the returned relerr! in: adapt(1,
lower, upper, minpts, maxpts, functn, eps, ...)
> integrate(dummy, -10000, 0)$value
Segmentation fault

I'm running R.1.2.0 on Debian Linux.

Regards
Achim


> version
         _                
platform i686-pc-linux-gnu
arch     i686             
os       linux-gnu        
system   i686, linux-gnu  
status                    
major    1                
minor    2.0              
year     2000             
month    12               
day      15               
language R   



-------------------------

Achim Zeileis
Institut fr Statistik
Technische Universitt Wien

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[Rd] segmentation fault in integrate (PR#812)
zeileis@ci.tuwien.ac.at