From h.miller at ms.unimelb.edu.au  Wed Feb 11 00:40:10 2009
From: h.miller at ms.unimelb.edu.au (h.miller at ms.unimelb.edu.au)
Date: Wed, 11 Feb 2009 00:40:10 +0100 (CET)
Subject: [Rd] PPR crash (PR#13517)
Message-ID: <20090210234010.7DA82282EF48@mail.pubhealth.ku.dk>

Full_Name: Hugh Miller
Version: 2.8.1
OS: XP
Submission from: (NULL) (128.250.24.101)


Hi there,

I've been looking at approaches that use the projection pursuit regression
function fairly (ppr) heavily, and have discovered that it crashes my R system
on occasion. It only happens with the inputs are pathological in some way I
don't understand. I have pasted such an example below.

Any help gratefully appreciated.

Regards,
Hugh

### I run the following code to obtain the crash:
bad <- read.csv("C:\\My directories\\bad.csv")
bady <- bad[,3]
badx <- bad[,1:2]

ppr(badx,bady, nterms=1)


### This is the data I read in from the bad.csv file:
"","","bady"
"1",-0.0348207628376986,1,-0.542937988158036
"2",-0.0191633397482220,2,-0.169266091065016
"3",-0.0341944659141195,1,-0.275406839429961
"4",0.0249905933641021,2,0.384150222915368
"5",0.0155961395104161,2,0.2341732751562
"6",-0.0792878444118122,2,-0.021997198276666
"7",-0.0248000120604336,1,0.399971463068032
"8",0.108914381123697,1,-0.623493578304602
"9",0.00620168565673016,1,-0.402266282137639
"10",-0.034507614375909,2,1.08390058914255
"11",-0.0905611890362353,2,0.024273472328843
"12",0.0459715403040008,1,-0.448251018679603
"13",-0.00976888589453599,2,0.70163011189378
"14",-0.0157187066685371,1,0.123718062829826
"15",-6.12835790604833e-05,2,0.0929302960910126
"16",0.107661787276539,1,0.0445186997621552
"17",-0.0238605666750649,2,-0.268966040102523
"18",0.0494161733836856,1,-0.244466585236197
"19",-0.0194764882100115,2,-0.272492268970116
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"22",-0.0263657543693812,1,-0.439522809120621
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"25",-0.0188501912864324,2,0.265535097126863
"26",0.0046359433477825,1,0.342255739372447
"27",-0.0961978613484469,2,0.328193133923304
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[Rd] PPR crash (PR#13517)
h.miller at ms.unimelb.edu.au