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Recent questions tagged data.table

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data.table - No RTools compatible with R version 3.5.0 was found

I had problems installing data.table for R version 3.5.0, and was advised to check that RTools was ... newer/different version. Any thoughts? See Question&Answers more detail:os...

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

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data.table - Adaptive moving average - top performance in R

I am looking for some performance gains in terms of rolling/sliding window functions in R. It is quite ... other function. Looking for a top performance. Question&Answers:os...

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

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data.table in R : the columns to join by must be specified using 'on=' argument error

I new in R language. i have two data.table like these : rts: id rt 1: 10_1 3180 2: 10_10 1680 3: 10_100 ... table-in-r-the-columns-to-join-by-must-be-specified-using-on-argument...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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data.table - Converting daily data to weekly data using R

I have the daily data of two stocks (Apple and Google) library(tidyquant) dt = tidyquant::tq_get(c("AAPL", ... .com/questions/65873070/converting-daily-data-to-weekly-data-using-r...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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403 views

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data.table - Label a sequence of row elements in a dataframe (R)

I am working with eye-tracking data and I am trying to create a new column 'SaccadePerTrial' which will count (and ... /65887293/label-a-sequence-of-row-elements-in-a-dataframe-r...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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data.table - Best possible way to add the likely event and its probability from a cross table in R

Using the mtcars dataset, I have created a cross table as follows - tab = with(mtcars, ftable(gear, cyl)) tab ... -to-add-the-likely-event-and-its-probability-from-a-cross-table...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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374 views

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data.table - Applying same factor levels to multiple variables with differing amount of levels in R

I have a data.table with 168 variables and 8,278 observations. Variables 69:135 are originally stored as ... -factor-levels-to-multiple-variables-with-differing-amount-of-level...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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data.table - Find closest Zip Code to another from two data tables in R

I have two separate data tables that I want to find the closet zip code from one data table to the other. From the ... /find-closest-zip-code-to-another-from-two-data-tables-in-r...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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507 views

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data.table - R- How can I update column values only pertaining to rows where column contains beginning of a certain number?

I have a dataset that looks as follows: ex <- data.frame("id" =c(rep(1234,6)), "case" = c(45,45,45,92, ... for? Or any other code that might be more efficient? Thanks in advance!...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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