search for: lorentzians

Displaying 7 results from an estimated 7 matches for "lorentzians".

Did you mean: lorentzian
2001 Oct 05
1
nls() fit to a lorentzian - can I specify partials?
First, thanks to all who helped me with my question about rescaling axes on the fly. Using unlist() and range() to set the axis ranges in advance worked well. I've since plotted about 300 datasets with relative ease. Now I'm trying to fit a lossy oscillator resonance to (the square root of) a lorentzian (testframe$y is oscillator amplitude, testframe$x is drive frequency): lorentz
2001 Jun 05
0
AW: [new?] Streaming technique
> But such thinking is invalid for nonlinear mechanisms. > [...] I may fit it with a set of 5 Lorentzians > or, for more accuracy, with 10 Lorentzians. Doing so, the > resulting 10 Lorentzians _wont_ include the less accurate > 5 Lorentzians as a subset! Since 'bitrate peeling' is already supported, I believe it would be possible to transmit the 'peeled' stream and another str...
2012 Oct 18
3
Upper limit in nlsLM not working as expected
Dear all, I am using the nlsLM function to fit a Lorentzian function to my experimental data. The LM algorithm should allow to specify limits, but the upper limit appears not to work as expected in my code. The parameter 'w', which is peak width at half maximuim always hits the upper limit if the limit is specified. I would expect the value to be in-between the upper and lower limit with
2001 Jun 05
5
[new?] Streaming technique
Hi, I have a newbie question, and a not-so-newbie one. I've just found out about Ogg, and I haven't been able to find a clear answer in the many webpages this proyect has (btw, why not create just one site instead of vorbis.com, ogg-vorbis.com...). The question is, does Ogg use perceptual coding, like mp3 does? And if so, would it be possible to build an encoder in such a way as to
2005 Nov 13
4
Robust Non-linear Regression
Hi, I'm trying to use Robust non-linear regression to fit dose response curves. Maybe I didnt look good enough, but I dind't find robust methods for NON linear regression implemented in R. A method that looked good to me but is unfortunately not (yet) implemented in R is described in http://www.graphpad.com/articles/RobustNonlinearRegression_files/frame.htm
2007 Nov 21
1
normalised Voigt random numbers
Dear list, I would like to generate random numbers from a Voigt distribution, hopefully in a way as simple as getting random numbers from a normal distribution with 'rnorm'. Is there any package to do this? Speed is an issue in this application. Or, as the Voigt distribution is a convolution of a Gaussian and a Lorentzian, can I simply combine random numbers from rnorm and rcauchy in some
2007 Nov 23
0
R users in Cyprus
Dear friends, are there enough R users in Cyprus to form a club? jason Dr. Iasonas Lamprianou Department of Education The University of Manchester Oxford Road, Manchester M13 9PL, UK Tel. 0044 161 275 3485 iasonas.lamprianou at manchester.ac.uk ----- Original Message ---- From: "r-help-request at r-project.org" <r-help-request at r-project.org> To: r-help at r-project.org