Displaying 20 results from an estimated 2000 matches similar to: "Can't find nls()"
2003 Feb 13
3
OO programming in R
Dear,
I'm looking for some examples on OO programming in R. I have the
programming manual with explanation on UseMethod and NextMethod but I
miss some practical examples to get me going (I hope). I searched the
web but could not find a good independent tutorial on this.
Any suggestions are welcome,
Kris
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2002 Nov 22
4
Use of variables to reference to objects
Hi,
I'm new to R and looking for a way to use a variable to reference to an
object.
I'm plotting several graphs on top of each other and want to do this by
a for loop. The field I want to graph have names like a1,a2,a3, ...
I can't figure out how to get this working:
It should look like this:
lines(spectral$Wavelength,paste("spectral$a",j,sep=""),col=j)
but
2003 Mar 25
1
geoR vector length error
Dear,
we have a problem with geoR. We try to read an ASCII table (x,y,z) with 40000
lines. With read.geodata we get the error:
Error in vector("double", length) : cannot allocate vector of length 799980000
We can read the file without any problem with read.table, but trying to
convert it to the geodata class gets the same error.
Any help/tips would be appreciated.
Kris, Dave
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2003 Apr 22
1
read.table and decimals
Dear,
We are trying to read an asciifile using the read.table() function and
discovered that only 4 decimals are read. Any idea how to get more decimals?
Kris
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http://perswww.kuleuven.ac.be/~u0027178/VCard/mycard.php?name=krisn
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Minds are
2002 Dec 01
1
Logistic regression
Hi,
I can't figure out how to get the P-values out of the summery of a logistic
regression. I used:
logit.out <- glm(...)
and then I should be able to extract just the P values for the coefficients.
Any idea?
Kris
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http://perswww.kuleuven.ac.be/~u0027178/VCard/mycard.php?name=krisn
2003 Aug 14
1
Contouring irregular xyz data via TIN
Dear,
I have XYZ data available in a MySQL database. I get it out, can plot
the data with the plot() function, load it into a geoR datastructure.
But what I actually would like to do is a simple contouring of the data
based on a no Kriging interpolation such as TIN based.
I know the first thing I shold do is interpolate a full matrix for the
region I have my points for, then contour should
2003 Aug 21
2
Read date for timeserie object
Dear all,
Is there a simple trick to read in data with the following format and
create a Time Serie object of it?
Date CountOfField2
5/10/1998 7
5/11/1998 5
5/12/1998 2
5/14/1998 1
5/15/1998 1
5/19/1998 1
5/20/1998 1
5/21/1998 1
5/24/1998 2
5/25/1998 1
5/26/1998 2
....
2002
...
R should recognize that some dates are not available...(NA). You can
define start and end date Ok, and frequency= 365
2003 Sep 01
2
readcsvIts() to create irregular time series
Dear,
Thanks for the previous tips about 'its' for importing the following
data.
5/10/1998,7
5/11/1998,5
5/12/1998,2
5/14/1998,1
5/15/1998,1
5/19/1998,1
5/20/1998,1
1. When using the following command;
test<-readcsvIts('Fires98.csv',informat=its.format("%m/%d/%Y"),header=FA
LSE)
the function reads in the data from the csv file as;
V2
05/10/1998 7
2003 Aug 11
0
tsdiag and tsStructure for np,ns,nt and nl determination
Hi R-Helpers,
I'm dealing with the STL procedure and trying to apply the tsdiag and
StructTS onto the ts object to analyse the different parameters which
need to be set. How can I use the tsStructure & tsdiag to create a
seasonal, trend and cycle subseries plot so that I can select & analyse
the correct np,ns, nt and nl?
The problem is that too much signal goes into the seasonal
2003 Jul 30
2
STL- TimeSeries Decomposition
Dear R Helpers,
Currently I'm working with the ts package of R and created a TimeSerie
from pixels extracted from satellite imagery(S10 NDVI data, 10 daily
composites). I'm trying to decompose this signal in different signals
(seasonal and trend).
When testing out the STL method is says => Only univariate timeseries
are allowed, but the current Timeserie I'm using is univariate!
2003 Oct 11
1
interpolation methods
Hello all,
I want to interpolate some data i prepared in GRASS, so I'm looking for what
interpolation methods are available for R. In GRASS I can do Splines with
tension and IDW. I'm looking for something like multiquadric equations. Is
there any function/package available fo rthis?
thanks all
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Carlos Henrique Grohmann de
2003 Jan 21
2
books on categorical data analyses
Dear All,
We are about to purchase the second edition of Agresti's "Categorical Data
Analysis" (my old copy of the first ed. of that wonderful book is falling
apart). I would appreciate suggestions about other comparable books which, if
possible, have examples using R/S code (instead of SAS).
Thanks,
Ram?n
--
Ram?n D?az-Uriarte
Bioinformatics Unit
Centro Nacional de
2003 Jan 14
3
PLS regression?
Hi all,
I would like to do some QSAR analysis (quantitative structure activity
relationship). I need to use some Partial Least Squares (PLS) regression,
but I have not seen this option on the R-project. Is it possible to do this
kind of regression on R?
thank you in advance
best regards,
olivier
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2006 Jan 04
2
Looking for packages to do Feature Selection and Classification
Hi All,
Sorry if this is a repost (a quick browse didn't give me the answer).
I wonder if there are packages that can do the feature selection and
classification at the same time. For instance, I am using SVM to classify my
samples, but it's easy to get overfitted if using all of the features. Thus,
it is necessary to select "good" features to build an optimum hyperplane
(?).
2004 Jan 15
4
SIR
Ich habe in R eine Version von SIR gefunden und ausprobiert. Leider kann
diese multivariate Responses nicht verarbeiten. Gibt es in R eine
ausgefeilte Version von SIR?
2003 Sep 16
1
simplifying randomForest(s)
Dear All,
I have been using the randomForest package for a couple of difficult
prediction problems (which also share p >> n). The performance is good, but
since all the variables in the data set are used, interpretation of what is
going on is not easy, even after looking at variable importance as produced
by the randomForest run.
I have tried a simple "variable selection"
2004 May 03
1
boxplot.formula with missing values (PR#6846)
If an array has missing values in different rows, plotting using the formul=
a=20
interface can produce errors. Example:
fake.data <- matrix(rep(-100:100, 4),
ncol =3D 4)
par(mfrow =3D c(1,2))
boxplot(fake.data ~ col(fake.data))
abline(h =3D 0, lty =3D 2)
boxplot(as.data.frame(fake.data))
abline(h =3D 0, lty =3D 2)
##### Add the missing data
fake.data[190:200, 1] <-
2003 Dec 11
2
typeIII SS for lme?
To avoid angry replies, let me first say that I know that the use of
Type III sums of squares is controversial, and that some statisticians
recommend instead that significance be judged using the non-marginal
terms in the ANOVA. However, given that type III SS is also demanded by
someā¦ is there a function (equivalent to drop1 for lm) to obtain type
III sums of squares for mixed models using the
2003 Dec 15
2
help in lme
To anyone who can help,
I have two stupid questions, and one fairly intelligent question
Stupid question (1): is there an R function to calculate a factorial of a number? That is...is there a function g(.) such that g(3) = 6, g(4) = 24, g(6) = 720, etc?
Stupid question (2): how do you extract the estimated covariance matrix of the random effects in an lme object?
Intelligent question
2003 Apr 14
5
removing NULL elements from a list
Dear All,
I have a list, where several components are NULL, and I'd like to obtain that
very same list without the NULL components (i.e., I do not want to unlist or
otherwise loose the rest of the list structure). I can do that with a loop,
but how could I do it without a loop?
Thanks,
Ram?n
--
Ram?n D?az-Uriarte
Bioinformatics Unit
Centro Nacional de Investigaciones Oncol?gicas (CNIO)