Displaying 20 results from an estimated 700 matches similar to: "Statistics on raster pictures - asking for an advice"
2009 Sep 06
3
Video Analysis?
What software exists for digitizing video to quantify the motion
of specific features in the image? I might be willing to use something
that's NOT in R, though I'd prefer something in R (or at least with an R
intereface).
Thanks,
Spencer Graves
2008 Feb 13
1
Modelling disease spread
I was at a lecture the other day and I saw a presentation of very neat
(short) animation modeling epidemic disease spread over a map region. When I
ask what software they used they mentioned SAS. Do you know if there are
equivalent resources in R to model the spread of disease with animation
output? My search in R-help and google didn't lead to any document (though I
found a couple of
2008 Jun 17
1
Reading OpenOffice Calc spreadsheet into R
I am in awe of the project you developed but wish to do something simpler.
I have recently decided to give up on Microsoft Office and wish to use
OpenOffice exclusively. In the past I have used the RODBC package to
read data from excel files. Do you know how to read data directly from
OpenOffice calc files into R?
Farrel Buchinsky
2007 Aug 23
4
Calculating diameters of cirkels in a picture.
Hi,
Maybe this is more a programming questions than a specific R-project question, but maybe there is someone who can point me in the right direction.
I have a picture of cirkels which I took with a digital camera.
Now I want to use the diameter of the cirkels on the picture for analysis in R.
I can use pixmap to import the picture, but how do I find the outside cirkels and calculate the
2007 Sep 26
1
Calling R function from Java
Hi - I would like to have the same functionality like what R(D)COM server offers but from Java world. I have java code (on windows) and need to call some R code to run some computational job and get the result back into java code. I'm wondering if there's any direct package that offers this functionality? Thank you.
- adschai
2009 Oct 09
2
different time series in one plot
Hello,
I need to put 2 or more different time series to one plot for comparison
each other. The problem is that the time series are irregular, moreover
the time lenghts and periods are not the same. Is there a way to manage
it in R?
Many thanks for any hint and advice in advance
Tomas
2009 Oct 26
2
basic statistics to csv
I know that my question is like a very newbie question, but at the moment
I stacked with it and I need a quick solution. I need to make an overall
statistical overview of various datasets, the summary() and numSummary()
functions are fully sufficient. My question is, how can I export results
to a spreadsheet-like file, as a .csv. For the summary() with an "x"
dataset I can use this way:
2008 Jul 03
2
PCA on image data
Dear R users,
i would like to apply a PCA on image data for data reduction.
The image data is available as three matrices for the
RGB values. At the moment i use
x <- data.frame(R,G,B)#convert image data to data frame
pca<-princomp(x,retx = TRUE)
This is working so far.
>From this results then i want to create a new matrix
from the first (second..) principal component. Here i stuck.
2009 Sep 13
2
zoo plot: yearly marks on X-Axis
On Sun, 2009-07-26 at 13:17 +0200, Poersching wrote:
> stvienna wiener schrieb:
> > Hi all,
> >
> > I am plotting a financial time series, but I need a more detailed X-Axis.
> >
> > Example:
> > x <- zoo(rnorm(1:6000), as.Date("1992-11-11")+c(1:6000))
> > plot(x)
> >
> > The X-Axis is labeled "1995", "2000"
2007 Feb 06
1
Attachment_fu ImageScience FreeImage thumbnail quality
I''ve tried migrating acts_as_attachment to attachment_fu (just to see
if I could replace RMagick with ImageScience+FreeImage), but the
quality of the thumbnails is just horrendous, blurred beyond
recognition (downscaling a 1280x1024 to a few considerably smaller
thumbnails).
Changing attachment_fu to use RMagick again and the thumbnails were
crispy sharp again.
I was wondering
2008 Mar 27
4
Execute R with *.RData argument
Dear R developers,
i would like to start R with a *.RData argument under Linux.
Something like R -f /home/user/workspace.RData
Is this possible?
Thanks in advance for any answers.
--
View this message in context: http://www.nabble.com/Execute-R-with-*.RData-argument-tp16323374p16323374.html
Sent from the R help mailing list archive at Nabble.com.
2008 Jun 18
2
highest eigenvalues of a matrix
DeaR list,
I happily use eigen() to compute the eigenvalues and eigenvectors of
a fairly large matrix (200x200, say), but it seems over-killed as its
rank is limited to typically 2 or 3. I sort of remember being taught
that numerical techniques can find iteratively decreasing eigenvalues
and corresponding orthogonal eigenvectors, which would provide a nice
alternative (once I have the
2009 Jul 25
1
yaxp problem for more irregular time series in one plot
Good day,
I'm trying to get more time series in one plot. As there are bigger
differences in values of variables I need logaritmic y axis.
The code I use is the following:
nvz_3_data <- read.csv('/home/tomas/R_outputs/nvz_3.csv')
date <- (nvz_3_data$date)
NO3 <- (nvz_3_data$NO3)
NH4 <- (nvz_3_data$NH4)
date_p <- as.POSIXct(date, "CET")
par(mfrow=c(2,1), ylog
2008 Aug 08
1
problem to load the RGrace package
When I am loading the RGrace package I am getting the following
errormessage:
Loading required package: RGtk2
Loading required package: grid
Loading required package: cairoDevice
Error in figure() : could not find function "gladeXMLNew"
Error : .onLoad failed in 'loadNamespace' for 'RGrace'
Error: package/namespace load failed for 'RGrace'
I am running R 2.7.1
2000 Nov 09
1
Alternative to Numerical Recipes
Some time ago I mentioned the online version of the book
"Numerical Recipes in C"
http://www.ulib.org/webRoot/Books/Numerical_Recipes/
and inadvertantly stirred up a hornets' nest.
I obtained from this book code to calculate the Incomplete beta
function. It appears in:
6.4 Incomplete Beta Function, Student?s Distribution, F-Distribution,
Cumulative Binomial Distribution, p.226,
and
2008 Oct 03
1
3D scatter, groups, RdbiPgSQL...
hello,
I wish to create some 3d scatter diagrams visualising different grouped
data set by a given field in the database. I tried the scatterplot3d
package, as well as the plot3d and scatter3d functions (both within the
rgl resp. Rcmdr package). My first question is, whether is it possibe to
group data in the scatterplot3d and plot3d, because I did not succeed to
use the groups = ...
2009 Sep 11
1
format (?) problems with data imported from postgres
Good day,
I read some data from a PostgreSQL database by a following script:
library(Rdbi)
library(RdbiPgSQL)
# conn becomes an object which contains the DB connection:
conn <- dbConnect(PgSQL(), host="localhost", dbname="BVS",
user="postgres", password = "*******")
query_duj_kal <- dbSendQuery(conn, "select zdroj as well, cas as date,
fe2,
2007 Apr 11
8
graphs superimposed on pictures?
Hi:
I am doing some work that involves plotting points of interest
superimposed on photographs and maps. I can produce the plots fine in R, but so far
I have had to do the superimposition externally, which makes it tedious to do exploratory work.
I have looked to see if there is some capability to put a background picture on a plot window,
but I have not found anything.
Advice, anyone?
Cheers
2012 Nov 22
1
problems with RPostgreSQL compilation
Hello,
I am trying to install RPostgreSQL, but without success at the moment, getting an errormessage - see below.
My OS is Fedora 17, R version 2.15.2, PostgreSQL 9.2.1 with Postgis 2.0.1 spatial extension.
Thank You for any help, advice or hint in advance.
Regards
Tomas
> install.packages("RPostgreSQL", dependencies=TRUE)
trying URL
2010 Apr 15
4
Does "sink" stand for anything?
Hello Everyone,
Learning about R and its wonderful array of functions. If it's not obvious, I usually try to find out what a function stands for. I think this helps me remember better.
One function that has me stumped is "sink." Can anyone tell me if this stands for something?
Thanks,
Paul
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