search for: wroberts

Dear R users, I am currently working in subsetting a zooreg() object using either window or subset. I have a solution but it may be a bit cumbersome when I start working with actual data. Your inputs would be greatly appreciated. Example: I have a zooreg() object that starts in 1997 and ends in 2001. This object contains daily data for the 4 years

Dear R users, I am a remote sensing researcher currently studying the use of LiDAR data for quantifying tree height, in particular I would like to determine the sample size needed to capture and quantify canopy height variability. To do this I have employed the use of automap(), which automatically calculates variograms including reporting the range of the variogram. The program is easy to use

Dear R users, I have a quick question regarding creating an index for a zoo object. I am using R 2.12 on winxp. I have read through the R archives searching for information on dates and time series analysis and nothing seems to cover my question. I am extracting data from a time series of remote sensing data. The frequency of the data is 16 days which means I cant use ts (ts likes months single

Hello, I'm running a samba 3.0.14a server in production on a fedora core 3 (kernel 2.6.9-1.667smp) with a least 250 clients (XP Pro SP2) (up to 400 sometimes). A few days ago, a problem appeared with a soft that we are using for a long time. (Petit Robert, a french dictionnary). When someone launch the dictionnary, many clients are freezed when they try to access to the "start

...n context: http://r.789695.n4.nabble.com/Significance-test-tp3836155p3836155.html > Sent from the R help mailing list archive at Nabble.com. > > > > ------------------------------ > > Message: 5 > Date: Fri, 23 Sep 2011 10:50:27 +0200 > From: "Wesley Roberts"<wroberts at csir.co.za> > To: "Gabor Grothendieck"<ggrothendieck at gmail.com>, "Achim Zeileis" > <Achim.Zeileis at uibk.ac.at> > Cc: r-help at r-project.org > Subject: Re: [R] Subsetting a zooreg object using window / subset > Message-ID:<4E7C6473020000...

Dear R users I am currently investigating time series analysis using an irregular time series. Our study is looking at vegetation change in areas of alien vegetation growth after clearing events. The irregular time series is sourced from Landsat ETM+ data, over a six year period I have 38 scenes. For certain periods I have monthly data while for others, images are up to three months apart. So far

Dear fellow R-users I am trying to do some imputation using K-NN with the yaImpute library. All seems to be going well until I try to use AsciiGridImpute. All my data are correctly formatted and I am able to run and view the results of yai. Below is my code: **************************************************************************************************** library("yaImpute") data

Hi All, I am busy using R to do some regression modelling and have been using plot(x,y,"") to visualise my variables. I would now like to label my points using data stored in the data.frame used for the regression analysis. For example each of my data points is made up of a field measured forest volume value and a remotely sensed vegetation estimate (NDVI). Each point is an enumeration