Re: [R] matching a sequence in a vector?

: Thursday, 16 February 2012 1:35 AM To: Martin Morgan Cc: r-help@r-project.org Subject: Re: [R] matching a sequence in a vector? On 15-02-2012, at 15:27, Martin Morgan wrote: On 02/14/2012 11:45 PM, Petr Savicky wrote: On Wed, Feb 15, 2012 at 02:17:35PM +1000, Redding, Matthew wrote: Hi All

[R] matching a sequence in a vector?

Hi All, I've been trawling through the documentation and listserv archives on this topic -- but as yet have not found a solution. I'm sure this is pretty simple with R, but I cannot work out how without resorting to ugly nested loops. As far as I can tell, grep, match, and %in% are not the

Re: [R] nls: singular convergeance

To: Redding, Matthew Cc: r-help@r-project.org r-help@r-project.org Sent: Thu Oct 13 18:04:53 2011 Subject: Re: [R] nls: singular convergeance On 13/10/11 18:02, Redding, Matthew wrote: Dear R-experts, I have 28 data points that I would like to fit with a non linear broken-stick -- with three fitted

Re: [R] nls: singular convergeance

regression tool. Can you let me know how it could be used? Thanks, Matt Redding -Original Message- From: Rolf Turner [mailto:rolf.tur...@xtra.co.nz] Sent: Thursday, 13 October 2011 6:46 PM To: Redding, Matthew Cc: r-help@r-project.org Subject: Re: [R] nls: singular convergeance On 13/10

Re: [R] nls: singular convergeance

more obvious. So I guess no amount of tweaking nls will help! Thanks for your time. Kind regards, Matt Redding -Original Message- From: Rolf Turner [mailto:rolf.tur...@xtra.co.nz] Sent: Friday, 14 October 2011 9:10 AM To: Redding, Matthew Cc: r-help@r-project.org Subject: Re: [R

[R] nls: singular convergeance

Dear R-experts, I have 28 data points that I would like to fit with a non linear broken-stick -- with three fitted parameters. When I view trace -- and use the final values as lines on the graph of data -- it looks pretty good. Q1. Why am I getting singular convergeance? Q2. Can you suggest

[R] strsplit and regex

Hi All, Is there a means to extract the 10 from 23:10:34 in one pass using strsplit (or something else)? tst - 23:10:34 For example my attempt strsplit(as.character(tst),^[0-9]*:) gives [[1]] [1] 34 Obviously it is matching the first two instances of [0-9]. Note that there may be only

Re: [R] strsplit and regex

Hi All, Just to make that question a bit harder - how do I apply that string extraction to vector of these time strings? Thanks, Matt Redding -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Redding, Matthew Sent: Thursday, 16 October 2008 7:54 AM

[R] lsoda( linking to GMP for big numbers from C code)

Hi R used with C-code experts, I had a look at the archives and did not find anything on this, so hopefully I am not doubling up. I have previously used the following approach where I needed some very small/large numbers (using Brobdingnag): surfacewithdiff - function(t, y, p) {

[R] tryCatch

Hi All R-Gurus, I am trying to debug a program, and I think tryCatch will help. The functions involved process through so many times before I encounter the error, things are a bit slow to use debug and browser(). I've read the help file and postings on conditions, and am still having

[R] nlm behaviour and error

Hi R-Gurus, I've been cutting along quite nicely with nlm, until I threw in the following condition in the function that nlm is minimising: if (((term*bexp) 0.0001)) { #warning(term*bexp, =term*bexp,psi,=psi) theta-2000 } Now when I run this function anywhere

[R] nlm and missing argument

Dear R Gurus, I am having a little difficulty with nlm. I've searched the archives and found nothing that tells me why this is occuring -- though there are some slightly similar issues. A simple example: lev2-function(aaa,bbb,ccc,ddd,eee){ res-aaa+bbb+ccc+ddd+eee res }

[R] indexing lists, using brobdingnagian

Dear R-Gurus, I have ended up with a calculation problem where I need to use brobs. I have to work my way through a vector with a for loop to act on each element in a calculation (refering to the previous value in the new vector of results -- so as far as I know I can't use apply) -- this

Re: [R] indexing lists, using brobdingnagian

. Matt Redding -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Redding, Matthew Sent: Wednesday, 28 May 2008 10:18 AM To: r-help@r-project.org Subject: [R] indexing lists, using brobdingnagian Dear R-Gurus, I have ended up with a calculation problem