Recent questions tagged data.table

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data.table - Create a table for N, Min/Max, SD, Mean, and Median in R

I'm very new to R, so please bear with me on this basic question. I have a dataset, DATA, that I created ... 002 .999 How can I accomplish this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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data.table - R - How to add rows for missing values for unique group sequences?

My problem is similar to this previous question Fastest way to add rows for missing values in a data.frame? I can' ... ) with no luck Thank you! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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data.table in r : subset using column index

DT - data.table with column "A"(column index==1), "B"(column index 2), "C" and etc for example next code makes ... - DT[.SD==2, .SDcols = 1] See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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data.table - Find rows with duplicate values across a small set of columns in R

Let's say that have a data.table with an id and integer values in four other columns. How can I ... by operation in the second solution. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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364 views

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data.table - R: How to judge Date in the same week?

I want create a new colume to represent which date are in the same week. A data.table DATE_SET contains Date ... to pecify "a same week". See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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data.table - R: fast (conditional) subsetting where feasible

I would like to subset rows of my data library(data.table); set.seed(333); n <- 100 dat <- data.table(id= ... be just as welcome if not more so. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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data.table - R collapse multiple rows into 1 row - same columns

This is piggy backing on a question I answered last night as I am reconsidering how I'd like to format my ... to using any function or package. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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478 views

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data.table - Find consecutive sequence of zeros in R

I have a data.frame really big (actually a data.table). Now, to simplify things, let's assume my data.frame is ... c(length(x), length(y)))) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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data.table - Create lagged variable in unbalanced panel data in R

I'd like to create a variable containing the value of a variable in the previous year within a group. id ... id date gen value_lagged=L.value See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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596 views

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data.table - Splitting text column into ragged multiple new columns in a data table in R

I have a data table containing 20000+ rows and one column. The string in each column has different number of ... efficient way to do this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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415 views

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data.table - R data table: update join

Suppose I have two data tables: X <- data.table(id = 1:5, L = letters[1:5]) id L 1: 1 a 2: 2 b 3: 3 c 4: 4 d ... c NA 10 4: 4 d g NA 5: 5 e h 12 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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318 views

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data.table - Sub-assign by reference on vector in R

Can I use sub-assign by reference on atomic vectors somehow? Of course without wrapping it in 1 column data. ... object still makes copy: gist. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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411 views

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data.table - What do . (dot) and % (percentage) mean in R?

My question might sound stupid but I have noticed that . and % is often used in R and to be frank I ... follow this logic, which confuses me. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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400 views

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data.table in R - multiple filters using multiple keys - binary search

I don't understand how I can filter based on multiple keys in data.table. Take the built-in mtcars dataset. ... what is the right approach here? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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331 views

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data.table - identify consecutively overlapping segments in R

I need to aggregate overlapping segments into a single segment ranging all connected segments. Note that a ... package GenomicRanges solution. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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380 views

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data.table package in R 3.5 does not install

I am currently using R 3.5 (beta version) and I need data.table package in my project but my package does not ... help me? What should I do? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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528 views

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data.table - Complexe non-equi merge in R

I'm trying to do a complexe non-equi join between two tables. I got inspired by a presentation in the last ... rows... Thanks for your help See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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