Displaying 20 results from an estimated 4000 matches similar to: "matrix matching NA"
2008 Mar 11
1
R-console vs. bash console (execution halted)
Dear Everyone,
I am using R 2.6.2 on my Redhat AS4. I installed the RPM offered on the cran website. I would like to use R from my bash console with the following command:
/path/to/R --vanilla --slave --args < /data/myscript.R
this script invokes a range of functions and tools, among others to process a bunch of raster images in a loop using GDAL. The thing is that releasing this command in
2012 Feb 19
3
Non-parametric test for repeated measures and post-hoc single comparisons in R?
Some attribute x from 17 individuals was recorded repeatedly on 6 time
points using a Likert scale with 7 distractors. Which statistical
test(s) can I apply to check whether the changes along the 6 time points
were significant?
set.seed( 123 )
x <- matrix( sample( 1:7, 17*6, repl=T ),
nrow = 17, byrow = TRUE,
dimnames = list(1:17, paste( 'T', 1:6, sep='' ))
)
I found
2008 Apr 09
4
apply lm() for all the columns of a matrix
Hi all,
My question is not really urgent. I can write a loop and solve the
problem. But I know that I'll be in a similar situation many more times so
it would be useful to find out the answer
Is there a fast way to perform linear fit to all the columns of a matrix?
(or in the one dimension of a multi-dimensional array.) I'm talking about
many single linear fits, not about a multiple fit.
2013 Feb 18
1
Calculating seasonal anomalies
I have an irregular time series, which cannot easily be converted to a ts
object (long stretches with NA).
I have calculated the climatological mean and st.dev, but need help on how
to calculate the anomalies from the climatology and my original data set.
Below is an example, where I have indicated the basic idea of what I want to
do under Question 1 and 2. I assume I will have to create a custom
2008 Sep 24
2
climatological standard deviation- (question re-posted)
Sorry for re-posting the question, I did not get any reply.
Kindly reply please if any one can.
###
Hello R users,
I have a montly time series over a several year period.
It's easy to compute a monthly climatology (12 values), Now, I would like to
calculate the corresponding standard deviation, ie the 12 values
calculated from the january values, february values, etc.
What's the best way
2001 Oct 22
3
Two questions
Greetings,
I have two questions that I could not answer from the
documentation.
A - ecdf and confidence intervals : Is there a (simple) way to generate
confidence intervals (95%) for a ecdf?
B - cross-validation of rpart trees : a colleague is using S to
generate decision tree and mentioned to me the use of cross-validation. Is
this function enabled in R ? if so, how should one proceed to
2006 Nov 20
1
Research Assistant position
University of California Merced
Merced, CA
Programmer Analyst II/III (Research Assistant)
Job Code SSNRI723A
Open until filled.
?
In the Sierra Nevada Research Institute at UC Merced, act in support of
research in applied climatology and statistical modeling for wildfire,
energy and water resource management applications and assist the
Principle Investigator with the development of software,
2002 Feb 15
2
difficult R-problem
Hi there
In the course of my diploma thesis in climatology I have encountered
a difficult R-Problem that I cannot solve. I want to fill R-Objects
(whose names should depend on j) with numbers at the i-th position.
The resulting Objects should be something like:
RQuadratStep1, RQuadratStep2, RQuadratStep3 ... filled with Elements like
c(0.324, 0.456, 0.657 ...)
Below is a short version of
2006 Aug 25
1
exact Wilcoxon signed rank test with ties and the "no longer under development" exactRanksumTests package
Dear List,
after updating the exactRanksumTests package I receive a warning that
the package is not developed any further and that one should consider
the coin package.
I don't find the signed rank test in the coin package, only the Wilcoxon
Mann Whitney U-Test. I only found a signed rank test in the stats
package (wilcox.test) which is able to calculate the exact pvalues but
unfortunately
2008 Sep 24
1
climatological standard deviation
Hello R users,
I have a montly time series over a several year period.
It's easy to compute a monthly climatology (12 values), Now, I would like to
calculate the corresponding standard deviation, ie the 12 values
calculated from the january values, february values, etc.
What's the best way for such a calculation ?
Regards,
Yogesh
--
Yogesh K. Tiwari (Dr.rer.nat),
Scientist,
Indian
2003 Jul 21
3
Confidence Band for empirical distribution function
Hi,
I was trying to draw an empirical distribution function with uniform
confidence bands. So I tried to find a way to calculate values of the
Kolmogorov-Smirnov Distribution but failed.
I guess it must be hidden somewhere (since the ks-test is implemented),
but I was unable to find it.
Is there any way to do this?
Thanks
Leif Boysen
2004 Sep 14
3
memory allocation error message
Dear all
I use the library(netCDF) to read in NCEP data. The file I want to read has size 113 Mb.
When i try to read it I get the following message:
Error: cannot allocate vector of size 221080 Kb
In addition: Warning message:
Reached total allocation of 255Mb: see help(memory.size)
I get a similar message when I try to read a file with 256 Mb in a PC with 2 GigaByte RAM.
Is there something
2002 Aug 23
3
y-axis with "break"
Dear R-users
I would like to draw a barplot with a special y-axis. Most of my data points are
in the range from -50 to 50, apart from one value that is 550. I would now like
to have a y-axis from -50 to 50, then a "break" and the "rest" of the y-axis,
let's say from 500 to 600. In order to make clear what I'm trying to do, I
attached a figure.
Is it possible to do
2009 Jul 23
1
Creating a loop to read 3D dataset
Dear all,
I have in my possession a netcdf from which I want to extract some data files. I have used the "ncdf" package to read the netcdf file and used the "get.var.ncdf" function to identify the variable i wish to use. The data is in the form of a time-series of geographical data points that relate to climatology variables. As such I have a large data frame,
2009 Aug 20
3
Wind-data analysis with R?
Hello,
are there people outside who use R for analysis of wind-measurement data
(meteorological or for planning of wind power stations)?
Are there already scripts/modules available for analysing and
displaying/plotting wind data in the way it is done in projection/planning
of wind power stations?
If not, would it be of interest to use R for this, and therefore
adapt data-logger output to R (by
2008 Jun 10
2
How to join data.frames and vectors of different length, in an inteligent way?
I have a data set something like this:
"YYYY", "Value"
1972 , 117
1984 , 73
1969 , 92
1976 , 113
1999 , 80
1996 , 78
1976 , 98
1984 , 106
1976 , 99
it could be created with:
> dafSamp <- data.frame(cbind(c(1972,1984,1969,1976,1999,1996,1976,1984,1976),c(117,73,92,113,80,78,98,106,99)))
The real dataset is of cause much larger, app. 100.000 samples
2004 Jul 20
9
Sort a data frame
Hi all
I have the next data frame
year STOD SLAGNR TAL TALT TALVEKT
1 2002 2120006 57 1 NA 1
2 1997 97030032 57 NA NA NA
3 1997 97030071 27 1 NA NA
4 1997 97030005 57 1 NA NA
5 1997 97020127 60 NA 1 NA
6 2001 1160025 27 1 NA 1
7 1998 98020069 60 1 NA NA
8
2004 Jul 05
4
extract columns from a dataframe
Dear R users,
I'm coming back to R after while. I have a data frame with 200 columns,
each column has a name. How to extract all columns to a new dataset, but
the specified (by names) ones?
I was playing with that for a little bit using the vector syntax but got
several syntax errors.
Thanks,
Rado
2012 Nov 21
1
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We are looking for a Web Application Developer who are passionate about
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2010 Aug 13
1
Polygon Graph in lattice/ lattice extra
Hi, I'd like to draw a polygon graph. I used the package lattice extra which
includes a function for that (see:
http://latticeextra.r-forge.r-project.org/#panel.xyarea&theme=default). But
i don't want the polygon ending with its filled border at the x-axis (like
in my code). Instead it should be rotated about 90 degrees and end with its
filled border at the y-axis.
I'm pleased