similar to: date conversation

Hello everybody, how can I reduce e.g. 30 days from a date? When I do the following "2011-05-01 CEST" -"2011-04-01 CEST" I get: "Time difference of 30 days" an thats fine. But when I try "2011-05-01 CEST" - 30 I get nonsense. So how can I subtract some days, month or years from a date? thanking you in anticipation Claudia Paladini

Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on hypatia.math.ethz.ch X-Spam-Status: No, hits=3.5 required=5.0 tests=BAYES_44,RCVD_IN_BL_SPAMCOP_NET autolearn=no version=2.63 X-Spam-Level: *** Dear ladies and gentlmen, I want to import a directory with about 400 files (.dat) in R. I know how to

Dear Claudia: Your question has many layers. Technically speaking, when I do "2011-05-01 CEST" -"2011-04-01 CEST" I get: > "2011-05-01 CEST" -"2011-04-01 CEST" Error in "2011-05-01 CEST" - "2011-04-01 CEST" : non-numeric argument to binary operator As previous posters suggest, storing the date strings as Date objects works

Hello! I want to create a plot with x- and y-labels writen in times or arial. How can I change the font? Thank you very much. Best regards Claudia

Dear ladies and gentlemen! In the help text for the xyplot (library(lattice), help(xyplot)) is an example given how one can use barchart: barchart(yield ~ variety | site, data = barley, groups = year, layout = c(1,6), ylab = "Barley Yield (bushels/acre)", scales = list(x = list(abbreviate = TRUE, minlength = 5)))

Hello! I used to save R-Grafics like this: postscript("file.ps"). Is there alsoa way to save them as eps? Thank you very much Claudia

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Dear ladies and gentlemen! When I use the plot funtion how can I change the size of the title for the x and y axes (xlab, ylab)and the size of the axes label ? Thank you very much. With best regards Claudia

Hello, I did some nice grafics using plot 3d and scatter3d. Is there a, hopefully not too complicated way, to transform these dynamic, three-dimensional and interactive grafics in a kind of executable file? I want to show and send them via e-mail to projekt partners who don`t use GNU R and who are not used to do programming. So the result should be quite comfortable to execute for them in

Dear All: I am calculating the relative importance of a regressor in a linear model. Does anyone know how I can obtain/install the 'pmvd' computation type? I am a US user. Regards, Y -- View this message in context: http://r.789695.n4.nabble.com/calc-relimp-pmvd-for-US-R-user-tp3808752p3808752.html Sent from the R help mailing list archive at Nabble.com.

Hello, I want to do a cluster analysis with my data. The problem is, that the variables dont't consist of single value but the entries are pairs of values. That lokks like this: Variable 1: Variable2: Variable3: . . . (1,2) (1,5) (4,2) (7,8) (3,88) (6,5) (4,7) (12,4) (4,4) . . . .

Hello everybody, I've got a problem concerning the function unique. I have got a data.frame "shopdata" with 1000 shop which were evaluated at different points in time. With function subset I chose those shops with more then 10 employee and store it in data.frame "bigshopdata" with 700 shops. bigshopdata=subset(shopdata, shopdata$employee>10) Now I use

Hello, are there fixed threshold values for the changes between different shades of blue in the corrgram? Or is a chang relative depending on the data? I didnt get it in manual. Thank you very much, best regards Claudia

Hello everbody, I want to generate different subsets of my data-set and safe this subsets with names listet in a vector. Because in reality I have got about 70 subsets I want to realize this in a loop Somehow like this: names=c("nam1",

Hello, I took my first steps in dynamic reports with Gnu R and used sweave(). I therefore run Sweave() with an example of Friedrich Leisch, starting like this: \ documentclass [ a4paper ]{ article } \ title { Sweave Example 1} \ author { Friedrich Leisch } \ begin { document } \ maketitle and so on. It worked very well but when I tried to compile the latex file I get this error message: !

Hello! I want to calculate simultaneous confidence intervals for a nominal variable with three categories: "yes", "no", "partially" and I expect that far more than 5 samples fall into each category. I have read that Glaz & Sison's method is only appropriate for variables with 7 or more categories. Therefore, the Goodman method seems like a good idea. I have

Hello everybody, I have got a data set with about 400 companies. Each company has a score for its enviroment comportment between 0 and 100. These companies belong to about 15 different countries. I have e.g. 70 companies from UK and 5 from Luxembourg,- so the data set is pretty unbalanced and I want to do an ANOVA. Somthing like aov(enviromentscore~country). But the aov function is just for

There is something wrong, I think, with the date-time conversion from a numeric value if you use Central European Time (CET) as timezone. Examples from R: If I use the GMT time zone it is OK, I get the same time back from as.POSIXct as I entered > as.POSIXct(as.numeric(strptime("30/01/2012 13:00:00", format="%d/%m/%Y >

Hello there fellow R-users, I have received some data which comes in the following format: example1<-"200301" The first 4 digits correspond to the year and the remaining 2 digits correspond to the week of the year. I have tried to convert this to a date by using strptime as follows: strptime(example1,format="%Y%U") where U (looking up strptime) is the week of the

At one time (version 1.7), the code below used to work for converting and extracting based on the Date Time. In version 1.8.1, something changed I know, but I cannot for the life of me figure out what... Data: UserName,RequestDate,PO,OrderDate,ExpDelivDate,Vendor,Total "Woody, Jim",12/19/2002,AP15063,1/7/2003,2/10/2003,Ames ,8570 "Harrold,