similar to: basic debugging

Hello, I created a data.frame which contains two columns: df$P (Power) et df$DateTime (time). I'd like to add a new column df$diffP (difference of Power between T and T-2). I made a loop : for (i in 3:length(df$DateTime)){ df$diffP[i] = df$P[i] - df$P[i-2] } execution time result is unaceptable: 24s !! Is there any way to reduce complexity about O(n) ? for example 2 or 3s (10s maxi)

Hello, I'd like to know how to plot several curves in the same frame (1curve = 1line=1day). For instance (csv file): 2012-02-01 01:00:00; 2100 2012-02-01 02:00:00; 2200 ... 2012-02-01 23:00:00; 2500 2012-02-02 01:00:00; 1000 2012-02-02 02:00:00; 1500 ... 2012-02-02 23:00:00; 1700 Here, I have to plot 2 curves in the same frame: 1 for 2012-02-01 (on the first line) and 1 for 2012-02-02 (on

Hi, Does anybody know why get I this kind of strange situation: Browse[2]> hcEnd [1] "2009-03-29 06:30:00" Browse[2]> class(hcEnd) [1] "POSIXlt" "POSIXt" Browse[2]> is.na(hcEnd) [1] TRUE This issue is the source of my all issues in my program, Thanks for your help -- View this message in context:

Hi, I 'd like to know how to retrieve a column name of a data frame. For instance : df = data.frame(c1=c('a','b'),c2=c(1,2)) > df c1 c2 1 a 1 2 b 2 I would like to retrieve the column name which value is 2 (here, the column is c2) thanks for your help -- View this message in context:

Hello, RStudio displays errors in french . I'd like to change it in english Please help, Thanks -- View this message in context: http://r.789695.n4.nabble.com/RStudio-how-to-change-language-from-fr-french-to-eng-english-tp4424972p4424972.html Sent from the R help mailing list archive at Nabble.com.

Hi, I'd like to debug in a loop (using debug() and browser() etc but not print() ). I'am looking for the first occurence of NA. For instance: tab = c(1:300) tab[250] = NA len = length(tab) for (i in 1:len){ if(i != len){ tab[i] = tab[i]+tab[i+1] } } I do not want to do "Browse[2]> n" for each step ... I'd like to declare a "browser()" in the loop

Hi everybody, I want to use macro in my R code. But defmacro was not in my libraries. So I installed it : > install.packages("gtools") Installing package(s) into ?C:/Program Files/R/R-2.13.2/library? (as ?lib? is unspecified) essai de l'URL 'http://cran.cict.fr/bin/windows/contrib/2.13/gtools_2.6.2.zip' Content type 'application/zip' length 102500 bytes (100 Kb)

Hi, I'd like to know if there is an equivalent for #ifdef (Clangage) in R. I 'd like to do something like: useDebug = defmacro(DEBUG, expr=(DEBUG==1)) if(useDebug(0)){ #Here I do not use debug mode make_addition = function(a, b) { c=a+b plot(c) return(c) } }else{ #here I use debug mode c=a+b } I assume this would work... The problem is : if

Hi, I'd like to plot a point: plot(1,2) I use RStudio. I'd like to know how to specify the length of Oy axis. I 'd like to put 20 as length of Oy but , by default, I 've got 2.5. Thanks for your help -- View this message in context: http://r.789695.n4.nabble.com/how-to-specify-the-Oy-axis-length-tp4372937p4372937.html Sent from the R help mailing list archive at Nabble.com.

Hi, I 'd like to know how to extract an interval of "hour:minute" type from a column of POSIXlt POSIXct type. For instance: my_data.csv: 4352;2011-09-02 21:30:00;3242; 4352;2011-09-02 21:31:00;3315; 4352;2011-09-02 21:32:00;4241; 4352;2011-09-02 21:33:00;5394; ... 4352;2011-09-02 01:02:00;67; 4352;2011-09-02 01:03:00;67; 4352;2011-09-02 01:04:00;67; .... I loaded

Hello, I'd like to classify data with kmeans algorithm. In my case, I should get 2 clusters in output. Here is my data colCandInd colCandMed 1 82 2950.5 2 83 1831.5 3 1192 2899.0 4 1193 2103.5 The first cluster is the two first lines the 2nd cluster is the two last lines Here is the code: x = colCandList$colCandInd y = colCandList$colCandMed m = matrix(c(x, y),

Hello, I have got a data frame df like this : > df e1 e2 e3 e4 1 1 11 1 21 2 2 12 2 22 3 3 13 3 23 4 4 14 4 24 5 5 15 5 25 6 6 16 6 26 7 7 17 7 27 8 8 18 8 28 9 9 19 9 29 10 10 20 10 30 where e1 ... e3 are vectors I have to select columns which median is in the interval [5;6] ( Here, for instance, e1 and e3) I would not want to use loop... (for, while) I search

Hi, I'd like to know how to get a vector of min value from many vectors without making a loop. For example : >v1 = c( 1, 2, 3) > v2 = c( 2, 3, 4) > v3 = c(3, 4, 5) > df = data.frame(v1, v2, v3) > df v1 v2 v3 1 1 2 3 2 2 3 4 3 3 4 5 > min_vect = min(df) > min_vect [1] 1 I 'd like to get min_vect = (1, 2, 3), where 1 is the min of v1, 2 is the min of v2

Hello, I 'd like to use some functions in myLib. So I do: library(myLib) Then I get this message: Error: package 'myLib' is not installed for 'arch=i386' > sessionInfo() R version 2.13.2 (2011-09-30) Platform: i386-pc-mingw32/i386 (32-bit) locale: [1] LC_COLLATE=French_France.1252 LC_CTYPE=French_France.1252 LC_MONETARY=French_France.1252 LC_NUMERIC=C

Hi, I 'd like to select the Date where myvalue =1800 appears the* first time*. For instance: df =data.frame(date, myvalue, ...) ... Date myvalue 2012-01-05 2500 2012-01-06 2450 *2012-01-07 1800* 2012-01-08 2200 2012-01-09 1800 I'd like to retrieve the third line. I do

This is a best practices / style question. The way I use RODBC is I something like this: > foo <- sqlQuery(db, "select * from foo") > apply(foo, 1, function{...}) That is, I use apply to iterate over each result -- row -- in the RODBC-produced dataframe. Is this how one generally wants to do this? My concern is that when apply iterates over the rows, it uses as.matrix()

It's often difficult to figure out what a problem data set looks like when someone pastes a mess of output from R into an e-mail. The dput command, used judiciously?I would hope no one would send a 1 M data set?can make life much easier. I wonder if it would be useful to add a hint in the instructions at the bottom of the posting page, where the list asks for self-contained reproducible

I'm running Windows 10 / R Studio / R Open 3.4.3 Since getting a new computer recently I cannot install packages into my personal libpath directory, and I can't seem to update packages (it says all packages are up to date even if I manually install an old version). I've got 100% admin rights on the computer and in the library folder, I've set my R environment variable to specify

Sorry, always end up not replying to the list: The main issue with dealing with next this way is that people adding new uses of next will probably not be using c++0x and therefore won't know it's ambiguous and that it needs to be qualified. There are also two issues with rvalue references and the STL: 1. EquivalenceClasses, in the insert and findLeader functions, it uses map functions

Hi all, experienced programmer but complete RoR newbie here, this is my first rails post/question so bear with me. I have a working RoR app on 1.2.4 and PostgreSQL, and my first efforts at running it in 2.0.2 show it does not cleanly upgrade without changes. Can anyone give me some hints/pointers as to what I''ll need to change for 2.0.2 and how do I identify it other than trial and