[R] (-8)^(1/3) == NaN?
Why does the expression (-8)^(1/3) return NaN, instead of -2? This is not answered by http://cran.r-project.org/doc/FAQ/R-FAQ.html#Why-are-powers-of-negative-numbers-wrong_003f Thanks, Dave [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] R-2.7.2 infected?
I tried downloading R-2.7.2 (http://cran.cnr.berkeley.edu/bin/windows/base/R-2.7.2-win32.exe, both from Berkeley and cran) and both times I got a warning from Computer Associates eTrust Antivirus (version 7.1.710) that the Win32/Adclicker.JO trojan was detected: The Win32/Adclicker.JO was detected in C:\USERS\USER\APPDATA\LOCAL\MICROSOFT\WINDOWS\TEMPORARY INTERNET FILES\LOW\CONTENT.IE5\61HAYRTG\R-2.7.2-WIN32[1].EXE. Has anyone else seen this? Thanks, Dave [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] R-2.7.2 infected?
Did you check the md5 checksum on it? Yes; it matched: 540090dd892657804d1099c54d6f770d You're the first to report it, and 2.7.2 has been out for almost a month, so I think it's likely that the CRAN copy is uninfected. Sounds promising. Perhaps it's a false positive from eTrust. If it matches and you still get the virus checker reporting, please let me know the details about that infection eTrust still reports the signature match for Win32/Adclicker.JO; but I don't know anything about Win32/Adclicker.JO. Unfortunately, eTrust doesn't provide a link to a description of Win32/Adclicker.JO. For what it's worth, I'm using version 7.1.710 of Computer Associates eTrust Antivirus (with version 31.6.6099 of its signature file). I'll try to find out more. Thanks, Dave -Original Message- From: Duncan Murdoch [mailto:[EMAIL PROTECTED] Sent: Monday, September 22, 2008 8:41 PM To: Dave DeBarr Cc: r-help@r-project.org Subject: Re: [R] R-2.7.2 infected? Dave DeBarr wrote: I tried downloading R-2.7.2 (http://cran.cnr.berkeley.edu/bin/windows/base/R-2.7.2-win32.exe, both from Berkeley and cran) and both times I got a warning from Computer Associates eTrust Antivirus (version 7.1.710) that the Win32/Adclicker.JO trojan was detected: The Win32/Adclicker.JO was detected in C:\USERS\USER\APPDATA\LOCAL\MICROSOFT\WINDOWS\TEMPORARY INTERNET FILES\LOW\CONTENT.IE5\61HAYRTG\R-2.7.2-WIN32[1].EXE. Has anyone else seen this? You're the first to report it, and 2.7.2 has been out for almost a month, so I think it's likely that the CRAN copy is uninfected. Did you check the md5 checksum on it? It matches on the original, so if it doesn't match at your end, you've got a bad download. If it matches and you still get the virus checker reporting, please let me know the details about that infection, and I'll try to do a manual inspection for it. Duncan Murdoch __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] R-2.7.2 infected?
For what it's worth, Computer Associates updated their signatures; and eTrust no longer reports the installation program for the Windows version of R-2.7.2 as infected. I found it surprisingly difficult to learn about how the Win32/Adclicker.JO virus operates, and how eTrust detects it. I couldn't even get anyone to admit it was a false positive (though it seems clear now). Regards, Dave From: [EMAIL PROTECTED] [EMAIL PROTECTED] On Behalf Of Ajay ohri [EMAIL PROTECTED] Sent: Tuesday, September 23, 2008 1:06 AM To: Peter Dalgaard Cc: r-help@r-project.org; Dave DeBarr; Duncan Murdoch Subject: Re: [R] R-2.7.2 infected? This is what it does. It seems like a false alarm because in case of actual infection it seems quite conspicious Ajay www.decisionstats.com http://www.spywareguide.com/product_show.php?id=2569 Full Name: Win32.AdClicker Websearch Read More Type:Trojan SG Index: 5 [Explain] Removal tools:List of products that detect/remove/protect against Win32.AdClicker: Desktop Anti-malware: Pro User: X-Cleaner Control IM and P2P use, block spyware and other malware: RTGuardian Endpoint Spyware Remediation: Greynet Enterprise Manager IM, P2P control, malware prevention and web filtering in single appliance: Unified Security Gateway Category Description:A Trojan is a program that enables an attacker to get nearly complete control over an infected PC. Frequently used tool by malicious hackers. When this program executes, the program performs a specific set of actions. This usually works toward the goal of allowing the trojan to survive on a system and open up a backdoor . Comment:This Trojan downloads many executable.It changes the autostarter randomly. It also hijacks the desktop and puts a wall paper saying that the system is affected and advertises a sites ?smart-security.info?.It duplicates each and every file which the user creates with the same name and in the same Directory. Properties: Adds other software Autostarts/Stays Resident Installs Through Exploit Opens ports On Tue, Sep 23, 2008 at 1:29 PM, Peter Dalgaard [EMAIL PROTECTED] wrote: Peter Dalgaard wrote: Dave DeBarr wrote: Did you check the md5 checksum on it? Yes; it matched: 540090dd892657804d1099c54d6f770d And it is binary identical to the Austria CRAN one. You're the first to report it, and 2.7.2 has been out for almost a month, so I think it's likely that the CRAN copy is uninfected. Sounds promising. Perhaps it's a false positive from eTrust. Likely. A quick Googling indicates that other programs have been caught too. This link is illuminative: http://www.cccp-project.net/forums/index.php?topic=2897.0 (I wanted to do the same thing with R, but http://www.virustotal.com has a 20M cap on the file size.) -- O__ Peter Dalgaard Øster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Regards, Ajay Ohri http://tinyurl.com/liajayohri __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Question about expression parser for "return" statement
I've noticed that if I don't include parentheses around the intended return
value for the "return" statement, R will assume the first parenthetical
expression is the intended return value ... even if that parenthetical
expression is only part of a larger expression.
Is this intentional?
I'm guessing it is intentional; but since there is no warning about
ignoring the rest of the expression, it could lead to hard-to-find bugs.
Thanks,
Dave
Here's an example ...
dnorm(2, 0, 1)
normalDensityFunction = function(x, Mean, Variance) {
# no parentheses surrounding the entire "return" value
return (1/sqrt(2*pi*Variance))*exp(-(1/2)*((x - Mean)^2)/Variance)
}
normalDensityFunction(2, 0, 1)# incorrect answer
normalDensityFunction = function(x, Mean, Variance) {
# parentheses surrounding the entire "return" value
return ((1/sqrt(2*pi*Variance))*exp(-(1/2)*((x - Mean)^2)/Variance))
}
normalDensityFunction(2, 0, 1)# correct answer
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