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Trying to use dates in their R-native form (e.g., POSIXct) rather than turning them into character strings, I've encountered the following problem. I create a data frame where one column is dates. Then I use "by()" to do a calculation on grouped subsets of the data. When I try to extract values from the result, I get "subscript out of bounds". The example below shows the

> From: r-devel-bounces at r-project.org=20 > [mailto:r-devel-bounces at r-project.org] On Behalf Of Prof Brian Ripley > Sent: Friday, November 14, 2008 2:25 AM > To: Duncan Murdoch > Cc: R-bugs at r-project.org; ocheyett at bonddesk.com;=20 > r-devel at stat.math.ethz.ch > Subject: Re: [Rd] (PR#13283) R crashes on sprintf with bad=20 > format specification >=20 > As R's sprintf is a wrapper for the OS's sprintf, misuse does=20 > run the risk of crashing from OS, and when it does the error=...

...e. Brian On Fri, 14 Nov 2008, William Dunlap wrote: >> From: r-devel-bounces at r-project.org >> [mailto:r-devel-bounces at r-project.org] On Behalf Of Prof Brian Ripley >> Sent: Friday, November 14, 2008 2:25 AM >> To: Duncan Murdoch >> Cc: R-bugs at r-project.org; ocheyett at bonddesk.com; >> r-devel at stat.math.ethz.ch >> Subject: Re: [Rd] (PR#13283) R crashes on sprintf with bad >> format specification >> >> As R's sprintf is a wrapper for the OS's sprintf, misuse does >> run the risk of crashing from OS, and when it doe...

Full_Name: Oren Cheyette Version: 2.7.2 OS: Win XP Submission from: (NULL) (64.161.123.194) Enter the following at the R command prompt: > sprintf("A %S %S %S XYZ", 1, 1, 1); Note the erroneous capitalized %S instead of %s and the numeric inputs instead of strings. With strings there's no crash - R reports bad format specifications.

* On 2008-11-13 at 18:51 -0500 Duncan Murdoch wrote: > On 12/11/2008 8:30 PM, ocheyett at bonddesk.com wrote: >> Full_Name: Oren Cheyette >> Version: 2.7.2 >> OS: Win XP >> Submission from: (NULL) (64.161.123.194) >> >> >> Enter the following at the R command prompt: >>> sprintf("A %S %S %S XYZ", 1, 1, 1); >> >>...

...message in context: http://www.nabble.com/Simulate-dataset-using-Parallel-Latent-CTT-model-in-R- tp21138080p21138080.html Sent from the R help mailing list archive at Nabble.com. ------------------------------ Message: 55 Date: Mon, 22 Dec 2008 18:57:44 -0500 From: "Oren Cheyette" <ocheyett at bonddesk.com> Subject: [R] nlsrob fails with puzzling error message on input accepted by nls To: <r-help at R-project.org> Message-ID: <D02BD122255CC64197F577C75CF172B0228D4A at mimail2.bdg.local> Content-Type: text/plain; charset="us-ascii" I have a nonlinear model es...

I have a nonlinear model estimation problem with ~50,000 data records and a simple 3 parameter model (logistic type - please don't tell me that there are linear methods for such a problem). I run nls with constraints once to get a good initial parameter guess, then try to run nlrob to get improved estimates. The model is well-behaved for the parameters that come from nls - no huge values, NAs