Displaying 20 results from an estimated 8000 matches similar to: "Need help in nlmeODE"
2005 Mar 16
0
use of covariates with nlmeODE
Dear R-helpers,
I have some problem with a model I am trying to run with nlmeODE. I have a
covariate that I want to include in the model and I can't find in the
documentation how to include it in the model so that it can calculate it.
>formula(trial)
PME ~ time | Ident
abcnoniso <- list(DiffEq=list(
debdt = ~ -ksol*pH*eb ,
desdt = ~
2012 Oct 08
2
PKPD modelling in R
Dear all,
I have two questions:
1. Does anyone know if nlmeODE package will work once odesolve is discontinued? If i understand well nlmeODE depends on odesolve.
2. Can anyone suggest another package I could use to fit complex PKPD models (described using differential equations) to data?
Thanks a lot!
Magdalena
2003 Jul 07
0
nlmeODE package combining NLME with a differential equation solve r
Dear All
A new non-linear mixed-effects modelling package for R called nlmeODE is now
available at www.cran.r-project.org and http://nlmeODE.sourceforge.net.
It combines Pinheiro and Bates' NLME library in R with an ordinary
differential equations (ODE) solver thereby enabling the use of differential
equations in population PK/PD modelling. It includes several PK examples
such as one- and
2005 May 20
1
Degradation model
Dear list,
I have a degradation model:
dX/dt = * I(X2)*( k1*X(t) )/( X(t)+k2 )
where X(t) is concentration at time t, and k1 and k2 are parameters
that I want to estimate. I(X) is a known inhibitor function.
My questions is whether this is implemented or easily computed in any
R package. I have searched the archives but without luck.
Any help or comments on this would be appreciated,
Klaus
2004 Jan 22
4
Fitting compartmental model with nls and lsoda?
Dear Colleagues,
Our group is also working on implementing the use of R for pharmacokinetic compartmental analysis. Perhaps I have missed something, but
> fit <- nls(noisy ~ lsoda(xstart, time, one.compartment.model, c(K1=0.5, k2=0.5)),
+ data=C1.lsoda,
+ start=list(K1=0.3, k2=0.7),
+ trace=T
+ )
Error in eval(as.name(varName), data) : Object
2004 Jun 08
1
Differential Equations
Hello!
I would like to know if R can solve Differential Equations...
I don't think so because, in my point, I see R like a Statistical System, not a
Math System. Am I wrong?
Thank you very much.
M??rcio de Medeiros Ribeiro
Graduando em Ci??ncia da Computa????o
Departamento de Tecnologia da Informa????o - TCI
Universidade Federal de Alagoas - UFAL
Macei?? - Alagoas - Brasil
Projeto CoCADa
2017 Jul 11
1
fit lognorm to cdf data
Hi
Great. I did not think that such combination is posssible.
Thanks.
Petr
> -----Original Message-----
> From: peter dalgaard [mailto:pdalgd at gmail.com]
> Sent: Tuesday, July 11, 2017 1:11 AM
> To: PIKAL Petr <petr.pikal at precheza.cz>
> Cc: r-help at r-project.org
> Subject: Re: [R] fit lognorm to cdf data
>
> How about
>
> proc <- c(0.9, 0.84, 0.5,
2017 Aug 17
2
strange behaviour read.table and clipboard
Hi
> -----Original Message-----
> From: Robert Baer [mailto:rbaer at atsu.edu]
> Sent: Wednesday, August 16, 2017 3:04 PM
> To: PIKAL Petr <petr.pikal at precheza.cz>; Duncan Murdoch
> <murdoch.duncan at gmail.com>
> Cc: r-devel at r-project.org
> Subject: Re: [Rd] strange behaviour read.table and clipboard
>
> You said, "put a name in the cell".
2018 Feb 08
0
plotting the regression coefficients
Hi
I copied your values to R, here it is
> dput(temp)
temp <- structure(list(par1 = structure(1:4, .Label = c("x1", "x2", "x3",
"x4"), class = "factor"), y1 = c(-0.19, 0.45, -0.09, -0.16),
y2 = c(0.4, -0.75, 0.14, -0.01), y3 = c(-0.06, -8.67, 1.42,
2.21), y4 = c(0.13, -0.46, 0.06, 0.06)), .Names = c("par1",
"y1",
2018 Feb 10
0
plotting the regression coefficients
Hi Peter;
The R code you provided works very well. Once again thanks so much for
this. The number of variables in my data set that should appear on the
y-axis is 733 and they are not numerical (for example the name of one
variable is *palmitoyl-arachidonoyl-glycerol (16:0/20:4) [1]**. So, the
plot looks very messy in one page. How can I make the plot to print out on
multiple pages?
Regards,
2017 Jun 21
4
How to apply a system of ordinary differential equations to a cell grid?
Hello,
I am developing an agent-based model to simulate the spread of infectious diseases in heterogeneous landscapes composed of habitat polygons (or clumps of connected cells). To simplify the model, I consider a habitat grid (or raster) containing the polygon ID of each cell. In addition, I have epidemiological parameters associated with each polygon ID. At each time step, the parameter values
2018 Feb 12
2
plotting the regression coefficients
Hi
Maybe there are other ways but I would split data to several chunks e.g. in list and use for cycle to fill multipage pdf.
With the toy data something like
library(reshape2)
library(ggplot2)
temp <- melt(temp)
temp.s<-split(temp, cut(1:nrow(temp), 2))
pdf("temp.pdf")
for (i in 1: length(temp.s)) {
p <- ggplot(temp.s[[i]], aes(x=par1, y=variable, size=abs(value),
2017 Aug 01
0
Superscript and subscrib R for legend x-axis and y-axis and colour different subjects in longitudinal data with different colours
Hi
Keep your messages coppied to R helplist, others could give you answers too.
See in line
From: Rosa Oliveira [mailto:rosita21 at gmail.com]
Sent: Tuesday, August 1, 2017 4:38 PM
To: PIKAL Petr <petr.pikal at precheza.cz>
Subject: Re: [R] Superscript and subscrib R for legend x-axis and y-axis and colour different subjects in longitudinal data with different colours
Hi Pikal,
I looked
2018 Feb 08
2
plotting the regression coefficients
Hi Petr;
Thanks so much. Exactly this is what I need. I will play to change color
and so on but this backbound is perfect to me. I do appreciate your help
and support.
Regards,
Greg
On Thu, Feb 8, 2018 at 1:29 PM, PIKAL Petr <petr.pikal at precheza.cz> wrote:
> Hi
>
> I copied your values to R, here it is
>
>
>
> > dput(temp)
>
>
>
> temp <-
2018 Feb 19
0
Putting 733 discrete categories on Y-axis in qqplot2 as they are
Hi
When you load external file to R, character variables are converted to factors by default and alphabetically sorted. I have limited connection to internet, so I cannot find the answer, you could try it yourself. Maybe you could try not to convert vector with names to factor, which, for plotting issue is not different from factor coding.
See ?read.table for details
However I am not sure if it
2017 Jul 04
0
R and UBUNTU startup
I did the same transition, facing the same issues, so I settled for installation of RKWard. This pretty much reproduces my previous experience with Tinn-R and the Rgui.
HTH
Ruben
________________________________
Ruben H. Roa-Ureta, Ph. D.
Senior Scientist,
Center for Environment and Water, Marine Studies Section,
King Fahd University of Petroleum and Minerals,
KFUPM Box 1927, Dhahran 31261,
2017 Jul 10
0
fit lognorm to cdf data
How about
proc <- c(0.9, 0.84, 0.5, 0.16, 0.1)
size <- c(0.144, 0.172, 0.272, 0.481, 0.583)
plot(size, proc, xlim=c(0,1), ylim=c(0,1))
fit<-nls(proc~plnorm(size, log(xmid), sdlog, lower=FALSE), start=list(xmid=0.2, sdlog=.1))
summary(fit)
lines(fitted(fit)~size)
-pd
> On 10 Jul 2017, at 16:27 , PIKAL Petr <petr.pikal at precheza.cz> wrote:
>
> Dear all
>
> I am
2017 Jul 04
0
R and UBUNTU startup
Q1. No.
Q2. What do you do? Did you follow the instructions at [1]? If you go to the top level of the R help system you should be able to open the manuals. ?help
Q3. Not that I know of. If you have difficulty with R on Linux then you should focus on learning how to use Linux in general... and learn what X-Windows is. But just as with Windows, googling your problem will usually lead to stepwise
2017 Aug 08
0
how to extract individual values from varcomp?
Hi
try
str(varcompobject)
to see structure of this object. You can extract parts by standard R means.
Cheers
Petr
> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Sharada
> Ramadass
> Sent: Tuesday, August 8, 2017 3:33 PM
> To: r-help at r-project.org
> Subject: [R] how to extract individual values from varcomp?
>
>
2018 Feb 08
0
plotting the regression coefficients
Hi
Example, example, example - preferably working.
Wild guess - did you try ggplot?
Cheers
Petr
> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of greg holly
> Sent: Thursday, February 8, 2018 8:14 AM
> To: r-help mailing list <r-help at r-project.org>
> Subject: [R] plotting the regression coefficients
>
> Hi Dear all;