search for: parabolas

I wonder whether R has methods for constrained fitting of linear models. I am trying fm<-lm(y~x+I(x^2), data=dat) which most of the time gives indeed the coefficients of an inverted parabola. I know in advance that it has to be an inverted parabola with the maximum constrained to positive (or zero) values of x. The help pages for lm do not contain any info on constrained fitting. Does anyone

Hi, I'm trying to get a toy program making use of nmmin to run successfully. I've gotten to the point of compiling. However, when I attempt to run my executable, I guess a bus error. I see that someone else has asked about using nmmin before <http://tolstoy.newcastle.edu.au/R/help/06/03/23944.html>, but I haven't come across any replies. Is there some documentation on how to

I'm maximising a reasonably complex function using nlme (version 3.1-65, have also tried 3.1-66) and am having trouble with fixed parameter estimates slightly away from the maximum of the log likelihood. I have profiled the log likelihood and it is a parabola but with sum dips. Interestingly changing the parameterisation moves the dips around slightly. Unfortunately the PNLS step is

I am trying to use the R API to call optim functions (nmmin, vmmin, lbfgsb, etc.) through a C program but I couldn't find the shared library to link under the R-2.6.0 build which is compiled under Linux (REL5). main.cpp:35: undefined reference to `Rf_initEmbeddedR(int, char**)' main.cpp:41: undefined reference to `nmmin' Thanks in advance for any help. ------------------------

Dear Members of the Help List, Honestly, I feel a little bit stupid - I would like to do something rather simple: fit a non linear model to existing data, to be more precise I wanted to start with simple higher order polynomials. Unfortunately, I do not quite understand the examples in the helpfiles for the nlm, nls and nlsModel commands. Could anyone please provide a simple example to get me

How do I calculate the confidence interval for the value x given by the intersection of two quadratics (i.e. parabolas)? I fit two quadratics of the form: y = C1 + B1*x + A1*x^2 y = C2 + B2*x + A2*x^2 to two sets of points N1 and N2. I test for whether they intersect, if they do then I calculate the roots of: 0 = (C1 - C2) + (B1 - B2)*x + (A1 - A2)*x^2 to determine where they intersect and choose the pro...

Hey there, I want to plot 5 parabola functions, which happen to be f(x) = 0.25x? + 6,47x -32.6 g(x)=0.99x? -6x -195 j(x)= 0.77x? +14x -495 k(x)=0.001x? + 65x -785 l(x) = 0.9x? -2x -636 in the same graph. Sadly I even do not really understand how to plot just one graph... I found this code in the Internet, which plots a cos-function: >x <- seq( -10, 10, length = 1000) >plot(x,

Full_Name: Karsten Krug Version: 2.4.0 OS: Open Suse 10.0, Windows XP Submission from: (NULL) (88.134.13.50) I found a problem in the 'optimise' function for one dimensional optimisation. Example 1: Try to find a maximum of the function below with the use of 'optimise' in the interval [0,0.5]. The function follows a parabola and has two local maxima located at the margins of

Dear R users, I used to "OPTIM" to minimize the obj. function below. Even though I used the true parameter values as initial values, the results are not very good. How could I improve my results? Any suggestion will be greatly appreciated. Regards, Kathryn Lord #------------------------------------------------------------------------------------------ x = c(0.35938587,

Dear R users, I used to "OPTIM" to minimize the obj. function below. Even though I used the true parameter values as initial values, the results are not very good. How could I improve my results? Any suggestion will be greatly appreciated. Regards, Kathryn Lord #------------------------------------------------------------------------------------------ x = c(0.35938587,

GENERAL REFERENCE ON NONLINEAR OPTIMIZATION? What are your favorite references on nonlinear optimization? I like Bates and Watts (1988) Nonlinear Regression Analysis and Its Applications (Wiley), especially for its key insights regarding parameter effects vs. intrinsic curvature. Before I spent time and money on several of the refences cited on the help pages for "optim",

Hi, I would like to run my monitor in Parabola OS with higher refresh rates. I'm using Nvidia 1050 Ti with nouveau drivers. Everything over 60 hz flickers. I have working settings for my panel captured from Windows settings panel (see: attachment). Could those settings help and could those be inputed to xrandr to fix flickering? -------------- next part -------------- An HTML attachment was

Dear R-users, I'm trying to solve the following equation, to get a set of values satisfying it and I'd like to know if its possible to do that in R. 0.85*(54.6-X)^2 + 4.65*(25.2 - Y)^2 -2*0.84*(54.6-X)*(25.2-Y) <= 8.29 Thanks a lot, Eduardo Armas --- [[alternative HTML version deleted]]

Hi  R users   I thankfull all R users for helping each other.   Could some one help me to  define data set for the following test functions: Step, Wave, Blip, Angles, Parabolas for  example , doppler function I can write dopp(n) to get data set of size n What about the functions mentioned above? [[alternative HTML version deleted]]

https://bugs.freedesktop.org/show_bug.cgi?id=41984 Bug #: 41984 Summary: nouveau lock all the system (NVIDIA GeForce GT 130M) Classification: Unclassified Product: xorg Version: 7.7 (2011) Platform: Other OS/Version: All Status: NEW Severity: normal Priority: medium Component:

which is the purpose of this functions? _________________________________________________________________ Busca desde cualquier p?gina Web con una protecci?n excepcional. Consigue la Barra de herramientas de Windows Live hoy mismo y GRATUITAMENTE. http://www.toolbar.live.com -------------- next part -------------- An HTML attachment was scrubbed... URL:

Dear R experts, density estimation on a 2 dimensional bounded domain --------------------------------------------------------------------- I am currently trying to estimate the probability density (PD) of cancers within the breast using the sm library with the routine sm.density Of course a practical PD must be limited by the curve of the breast outline. I don't have a clue after perusing

https://bugs.freedesktop.org/show_bug.cgi?id=100167 Bug ID: 100167 Summary: nouveau sometimes doesn’t resume properly from suspend Product: xorg Version: unspecified Hardware: x86-64 (AMD64) OS: Linux (All) Status: NEW Severity: normal Priority: medium Component: Driver/nouveau

Richard Zimmerman wrote: > I've got a 3 building network... > > Buildings 1/2 between then have 3 wireless routers all pointed to one > CentOS server. > > The 3rd building across the WAN has 3 wireless routers all into one > server... > > In my case They are for local LAN access so they are setup to pint to a > single IP/gateway address... Thanks for your

https://bugs.freedesktop.org/show_bug.cgi?id=97192 Bug ID: 97192 Summary: SuperTuxkart graphic errors [NVE4 - GK104] Product: Mesa Version: unspecified Hardware: x86-64 (AMD64) OS: other Status: NEW Severity: normal Priority: medium Component: Drivers/DRI/nouveau Assignee: