I have a dataset that looks like this:

```
set.seed(1234)
DT<-data.table(id=c(rep(c("a","b","c","d"),5)),
year=rep(seq(from = 2010.5,to=2012.5,by = .5),each=4),
value=rnorm(20,10,1))
DT
id year value
1: a 2010.5 8.792934
2: b 2010.5 10.277429
3: c 2010.5 11.084441
4: d 2010.5 7.654302
5: a 2011.0 10.429125
6: b 2011.0 10.506056
7: c 2011.0 9.425260
8: d 2011.0 9.453368
9: a 2011.5 9.435548
10: b 2011.5 9.109962
11: c 2011.5 9.522807
12: d 2011.5 9.001614
13: a 2012.0 9.223746
14: b 2012.0 10.064459
15: c 2012.0 10.959494
16: d 2012.0 9.889715
17: a 2012.5 9.488990
18: b 2012.5 9.088805
19: c 2012.5 9.162828
20: d 2012.5 12.415835
```

I want to add 3 columns which are quite alike, `value_previous_6m`

, `value_previous_y`

and `value_next_y`

for each ID. Row 10 should then look like this:

```
id year value value_previous_6m value_previous_y value_next_y
b 2011.5 9.109962 10.50606 10.27743 9.088805
```

I would like to do avoid a plyr function because the total dataset is quite large.

Many thanks in advance, Tim

Edit: I know that it can be done with the merge function:

```
set.seed(1234)
DT<-data.table(id=c(rep(c("a","b","c","d"),5)),
year=rep(seq(from = 2010.5,to=2012.5,by = .5),each=4),
value=rnorm(20,10,1))
DT6mp <- copy(DT)
DT12mp <- copy(DT)
DT6mp[,year:=year-.5]
setkey(DT6mp,id,year);setkey(DT,id,year);setnames(DT6mp,"value","value6mp")
DT <- merge(DT,DT6mp,all.x=T,all.y=F,allow.cartesian=T)
DT12mp[,year:=year-1]
setkey(DT12mp,id,year);setkey(DT,id,year);setnames(DT12mp,"value","value12mp")
DT <- merge(DT,DT12mp,all.x=T,all.y=F,allow.cartesian=T)
DT
```

But I think there should be a nicer method.

Answer:

You can use this approach ( I voluntary did not aggregated the 3 columns addition to make it clearer):

```
DT[,c('value_previous_6m'):=.SD[match(year-0.5, .SD$year),value], id][
,c('value_previous_y'):= .SD[match(year-1, .SD$year),value], id][
,c('value_next_y'):=.SD[match(year+1, .SD$year),value], id][]
# id year value value_previous_6m value_previous_y value_next_y
# 1: a 2010.5 8.792934 NA NA 9.435548
# 2: b 2010.5 10.277429 NA NA 9.109962
# 3: c 2010.5 11.084441 NA NA 9.522807
# 4: d 2010.5 7.654302 NA NA 9.001614
# 5: a 2011.0 10.429125 8.792934 NA 9.223746
# 6: b 2011.0 10.506056 10.277429 NA 10.064459
# 7: c 2011.0 9.425260 11.084441 NA 10.959494
# 8: d 2011.0 9.453368 7.654302 NA 9.889715
# 9: a 2011.5 9.435548 10.429125 8.792934 9.488990
#10: b 2011.5 9.109962 10.506056 10.277429 9.088805
#11: c 2011.5 9.522807 9.425260 11.084441 9.162828
#12: d 2011.5 9.001614 9.453368 7.654302 12.415835
#13: a 2012.0 9.223746 9.435548 10.429125 NA
#14: b 2012.0 10.064459 9.109962 10.506056 NA
#15: c 2012.0 10.959494 9.522807 9.425260 NA
#16: d 2012.0 9.889715 9.001614 9.453368 NA
#17: a 2012.5 9.488990 9.223746 9.435548 NA
#18: b 2012.5 9.088805 10.064459 9.109962 NA
#19: c 2012.5 9.162828 10.959494 9.522807 NA
#20: d 2012.5 12.415835 9.889715 9.001614 NA
```

r,string

I've got a vector with a long list of dataset names. E.g myvector<-c('ds1','ds2,'ds3') I'd like to use the names ds1..ds3 to write a file, taking the file name from the vector. Like this: write.csv(dataset[i],file=paste(myvector[i],'.csv',sep='') with dataset being d1...ds3, but without quotes. How can I remove the quotes and refer to...

r

If I do the following to a string of letters: x <- 'broke' y <- nchar(x) z <- sequence(y) How do I store every value of the z that isn't the first, last, or middle values of the sequence. In this example if z is 1 2 3 4 5...

r,time-series

I am trying to fit a subset model with only lag 4. In the manual it's written "you must use p=c(0,0,0,4) since p=4 will fit a full AR(4)". I did this. #fit a subset model with just lag 4 Fit=FitAR(p=c(0,0,0,4), lag.max = "default", ARModel = "ARz") However, I get the...

r,data.table,stata,code-translation

Just came across a .do file that I need to translate into R because I don't have a Stata license; my Stata is rusty, so can someone confirm that the code is doing what I think it is? Here's the Stata code: collapse (min) MinPctCollected = PctCollected /// (mean) AvgPctCollected...

r,count,duplicates

I've got a column A, which has several values, some of them repeating. So, example: A = c(5, 9, 6, 5, 5). I need to go through A and count the frequencies of each of the values in A. So, for this example, for the set of 5s in A,...

r,oop

I have a number of matrices of the same size: m1.m <- matrix(c(1,2,3,4), nrow=2, ncol=2) m2.m <- matrix(c(5,6,7,8), nrow=2, ncol=2) ... I want to set uniform column and row names to all of them. Currently I am doing it like this: new_col_names <- c("Col1","Col2") new_row_names <- c("Row1","Row2") change_names <- function(m,...

r,google-maps,ggmap

Few days ago I was familiarizing myself with displaying maps, plotting points on the map from http://rpubs.com/nickbearman/r-google-map-making Today, I have intermittent success in displaying maps. library(ggmap) map <- qmap('Anaheim', zoom = 10, maptype = 'roadmap') Outputs Map from URL : http://maps.googleapis.com/maps/api/staticmap?center=Anaheim&zoom=10&size=640x640&scale=2&maptype=roadmap&language=en-EN&sensor=false And when I go to the URL...

r,optimization,circular,maximization

Background: I am interested in localizing a sound source from a suite of audio recorders. Each audio array consists of 6 directional microphones spaced evenly every 60 degrees (0, 60, 120, 180, 240, 300 degrees). I am interested in finding the neighboring pair of microphones with the maximum set of...

r,statistics,histogram

How do I get a histogram-like summary of interval data in R? My MWE data has four intervals. interval range Int1 2-7 Int2 10-14 Int3 12-18 Int4 25-28 I want a histogram-like function which counts how the intervals Int1-Int4 span a range split across fixed-size bins. The function output should...

r,google-maps,ggmap

I have a dataset that looks like this: LOCALITY numbers 1 Airoli 72 2 Andheri East 286 3 Andheri west 208 4 Arya Nagar 5 5 Asalfa 7 6 Bandra East 36 7 Bandra West 72 I want to plot bubbles (bigger the number bigger would be the bubble) inside...

r,if-statement,recursion,vector,integer

Given a sorted vector x: x <- c(1,2,4,6,7,10,11,12,15) I am trying to write a small function that will yield a similar sized vector y giving the last consecutive integer in order to group consecutive numbers. In my case it is (defining groups 2, 4, 7, 12 and 15): > y...

r,data.table

I have the following situation: 1) a list of data tables 2) For testing purposes I deliberately want to (deeply) copy the whole list including the data tables 3) I want to take some element from the copied list and add a new column. Here is the code: library(data.table) x...

r

I want to model that a factory takes an input of, say, x tonnes of raw material, which is then processed. In the first step waste materials are removed, and a product P1 is created. For the "rest" of the material, it is processed once again and another product P2...

r,vector,percentage

This is my vector head(sep) I must find percent of all SEP 11 in each row. For instance, in first row, percent of SEP 11 is 100 * ((63 + 124)/ (63 + 124 + 0 + 0)) And would like this stored in newly created 8th column Thanks dput...

r,excel

I'm trying to convert a column showing the time of road traffic accidents from military time to standard time. The data looks like this: Col1 Time..24hr. 1 1404 2 322 3 1945 4 1005 5 945 I'd then like to convert to 12hr so for '322' I'd like to make...

r,ggplot2

Is there an equivalent in ggplot2 to plot this dataset? I use matplot, and read that qplot could be used, but it really does not work. ggplot/matplot data<-rbind(c(6,16,25), c(1,4,7), c(NA, 1,2), c(NA, NA, 1)) as.data.frame(data) matplot(data, log="y",type='b', pch=1) ...

r,dictionary,spatial

I am working on a large data set with spatial data (lat/long). My data set contains some positions that I don´t want in my analysis (it makes the files to heavy to process in ArcMap- many Go of data). This is why I want to subset the relevant data for...

r

We have seven exposures and 24 groups. We would like to randomly assign five of the seven exposures to groups while also ensuring that we end up with a consistent count for each exposure, meaning that each exposure ends up being exposed about the same number of times. I have...

r,loops,for-loop,shiny

In my shiny app, I build a a number of checkboxes using a for loop, like this: landelist <- c("Danmark", "Tjekkiet", "Østrig", "Belgien", "Tyskland", "Sverige", "USA", "Norge", "Island") landecheckbox <- c() for (land in landelist){ landechek <- paste0("<label class=\"checkbox inline\"><input id=\"", land, "\" type=\"checkbox\" checked><span>", land, "</span></label>") landecheckbox <- c(landechek,...

r,ggplot2

I'm working with some data that I want to display as a nxn grid of plots. Edit: To be more clear, there's 21 categories in my data. I want to facet by category, and have those 21 plots in a 5 x 5 square grid (where the orphan is by...

r,string-split,stemming,text-analysis

I had a text data frame having sentences, and as I wanted the list of separate words in another dataframe I used the "qdap package" function "all_words" Words = all_words(df$problem_note_text, begins.with=NULL , alphabetical = FALSE, apostrophe.remove = TRUE, char.keep = char2space, char2space = "~~") Now have a dataframe which has...

r

I'm trying to chop up a text file into the articles it contains. Usually this is done by identifying a pattern each article begins with. Unfortunately the database I downloaded the articles from doesn't have that. The only pattern I can find is that after each article there are 3...

r,posix,posixct

This question already has an answer here: Getting consist units from diff command in R 4 answers I successfully subtracted two POSIXct cols of df1 (below). However, since the time differences are >= 1 hour in all rows, R gives the results in hours. I know that this make...

r,graph,highlight

library(season) plot(CVD$yrmon, CVD$cvd, type = 'o',pch = 19,ylab = 'Number of CVD deaths per month',xlab = 'Time') if i wanted to highlight a region of the graph based on x values say from 1994-1998 how do i do this? Any thought would be appreciated Thanks....

r,large-data

I have a large data set, one of the files is 5GB. Can someone suggest me how to quickly read it into R (RStudio)? Thanks

r,shiny

I am playing around with the shiny packages for some hours now, and wanted to make a select input widget that enables me to download a certain data set from the server. So i figured out a way to get me this data frame containing all my IDs for downloading:...

r,sapply

This code is suppose to take in a word, and compute values for letters of the word, based on the position of the letter in the word. So for a word like "broke" it's suppose to compute the values for the letter "r" and "k" strg <- 'broke' #this part...

r

I have two tables, one with property listings and another one with contacts made for a property (i.e. is someone is interested in the property they will "contact" the owner). Sample "listings" table below: listings <- data.frame(id = c("6174", "2175", "9176", "4176", "9177"), city = c("A", "B", "B", "B" ,"A"),...

r

user_id date datetime page 217568 6/12/2015 49:23.9 Vodafone | How to get in touch with Vodafone 135437 6/10/2015 43:35.7 My VodafoneÂ â€“ Manage your Vodafone Pay Monthly Account Online â€“ Vodafone 196094 6/13/2015 33:39.4 Check the status of Vodafoneâ€™s mobile network in real-time 74197 6/6/2015 52:46.1 undefined 153501 6/5/2015 02:55.5...

r,subset

I have the following data frame which I imported into R using read.table() (I incorporated read.table() within read_data() which is a function I created that also throw messages in case the file name is not written appropriately): > raw_data <- read_data("n44.txt") [1] #### Reading txt file #### > head(raw_data) subject...

java,r,rjava

How to call java method which returns list from R Language.

r,shiny,sleep

I have a WebApp that have some renderUI({})... and some of them depend on the input of another. This makes that, briefly, a red error in the webpage appear when I select some options. Because the if() clause of some renderUI({}) depend on the input of a selectizer. The error...

r,loops,data.frame,append

How do I put what I printed in a dataframe with a for loop and if else statements? Basically, this code: list<-c("10","20","5") for (j in 1:3){ if (list[j] < 8) print("Greater") else print("Less") }) #[1] "Less" #[1] "Less" #[1] "Greater" Or should it be something more like this? f3 <-...

r,time-series,forecasting

I've been doing a variety of models in R with time series data (in XTS format) and I keep running into the same issue where there's no date / time component to the fitted values / forecasts and thus I can't graph them on the same graph as the original...

r,plot,ggplot2,cdf

Currently I am doing some cumulative distribution plot using R and I tried to set x-axis with decreasing power values (such as 10000,1000,100,10,1) in equal sizes but I failed: n<-ceiling(max(test)) qplot(1:n, ecdf(test)(1:n), geom="point",xlab="check-ins", ylab="Pr(X>=x)")+ geom_step() +scale_x_reverse(breaks=c(10000,1000,100,10,1)) +scale_shape_manual(values=c(15,19)) It seems that the output has large interval for 10000, then all the...

r,fread

I am interested to skip some lines of my data frame before the header names . How can i do it by skiping all the lines before ID_REF or if ID_REF is not present, check for the pattern ILMN_ and deleting all the lines keeping immediate first if not containing...

r,correlation

I would like to correlate two variables and have the output reported separately for levels of a third variable. My data are similar to this example: var1 <- c(7, 8, 9, 10, 11, 12) var2 <- c(18, 17, 16, 15, 14, 13) categories <- c(1, 2, 3, 1, 2, 3)...

r,dataframes,vectorization

I've got a dataframe that includes columns like the one on the right here: lengthArray speed_max 1 4 24, 18, 24, 18 2 10 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 3 4 -999, -999, -999, -999 4 2 -999, -999 5 2 18, 18 6 1...

r,time-series,nan,zoo

I am trying to run some trading strategies in R. I have downloaded some stock prices and calculated returns. The new return dataset has a number of -inf, NaN, and NA values. I am reproducing a row of the dataset (log_ret). Its a zoo dataset. library(zoo) log_ret <- structure( c(0.234,-0.012,-Inf,NaN,0.454,Inf),...

r,conditional,subset,find-occurrences

I have quite a simple dataset: ID Value Time 1 censored 1 1 censored 2 1 uncensored 3 1 uncensored 4 1 censored 5 1 censored 6 2 censored 1 2 uncensored 2 2 uncensored 3 2 uncensored 4 2 censored 5 I want to keep the first uncensored occurrence,...

r,date,csv

This question already has an answer here: as.Date with dates in format m/d/y in R 2 answers My problem is that the as.Date function does not convert the values in a "date" column of a data frame into Date objects. I have a data.frame nmmaps. Here is a short...

r

I have a string which has a complex format, how can I use complex() to treat it as a complex number? For example: myStr="0.76+0.41j" now I want to do sth like: myStr_complex=complex(myStr) # my question is how should I do this part? Eventually Im(myStr_complex) should print 0.41 ...

r,paste,assign,names

I am using a for loop to read in multiple csv files and naming the datasets import1, import2, etc. For example: assign(paste("import",i,sep=""), read.csv(files[i], header=FALSE)) However, I now want to rename the variables in each dataset. I have tried the following: names(as.name(paste("import",i,sep=""))) <- c("xxxx", "yyyy") But get the error "target of...

r,function,optimization,mathematical-optimization

I'm attempting to write a formula that will determine a value of a that minimizes the function output myfun (i.e. a-fptotal). MWE: c <- as.matrix(c(.25,.5,.25)) d <- as.matrix(c(10000,12500,15000)) e <- 700 f <- 1.1 tr <- .30 myfun <- function(a) { b <- max(a-e,0) df <- data.frame(u1=c(c*b*.40),u2=c(c*b*.60)) df$year <- 1:nrow(df)...

r,rbind

The initial data frame mergedDf is PROD_CODE 1 PRD0900033,PRD0900135,PRD0900220,PRD0900709 2 PRD0900097,PRD0900550 3 PRD0900121 4 PRD0900353 5 PRD0900547,PRD0900614 After calling mergedDf<-data.frame(do.call('rbind', strsplit(as.character(mergedDf$PROD_CODE),',',fixed=TRUE))) Output becomes X1 X2 X3 X4 1 PRD0900033 PRD0900135 PRD0900220 PRD0900709 2 PRD0900097 PRD0900550 PRD0900097 PRD0900550 3 PRD0900121 PRD0900121 PRD0900121 PRD0900121 4 PRD0900353 PRD0900353 PRD0900353 PRD0900353 5 PRD0900547 PRD0900614...

r,timer

I have a program to execute per 15 seconds, how can I achieve this, the program is as followed: print_test<-function{ cat("hello world") } ...

r,colors,ggplot2

Before I start, allow me to explain my graph: I have two Genotypes (WTB and whd) and each have two conditions (0 and 7), so I have four lines. Now, I want to make a plot where each variable and its condition is the same color. Anything with whd will...

r

I am using R for a project and I have a data frame in in the following format: A B C 1 1 0 0 2 0 1 1 I want to return a data frame that gives the Column Name when the value is 1. i.e. Impair1 Impair2 1...