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Questions - data.table

Problem with non-standard evaluation in disk.frame objects using data.table syntax

Problem I'm currently trying to write a function that filters some rows of a disk.frame object using regular expressions. I, unfortunately, run into some issues with the evaluation of my search string...
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Joshua Entrop

r

data.table

non-standard-evaluation

disk.frame

Votes: 0

Answers: 2

Latest Answer

While I don't know the exact cause of this, it has to do with environments, search path, etc. For instance, these work: storms_df[name %like% "^A"] nm <- "^A" storms_df[name %l...
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r2evans

Using sample() to sample from nested lists in R

I'm looking for a way to use sample() to sample values from different lists based on a value in another column of a data.table - at the moment I'm getting a recursive indexing failed error - code and ...
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davidj444

r

random

data.table

Votes: 0

Answers: 1

Latest Answer

Two problems: inc.outcomes[[index]] is a problem since index is 60-long here, meaning you are ultimately trying inc.outcomes[[ c(1,1,...,2,2,...,3,3) ]], which is incorrect. [[-indexing is either len...
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r2evans

How to calculate maximum value including string?

I want to keep the string while using .SD, max . data <- data.table(id = c("a", "a", "b", "c"), s1 = c(1, 3, 2, 2), s2 ...
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ghgh

r

data.table

Votes: 0

Answers: 3

Latest Answer

The best solution I can think of is this: colList <- c("s1", "s2", "s3") out_data <- data[, (colList) := lapply(.SD, function(x) ifelse(x == max(x), x, 0)), by=.(id...
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koolmees

sapply over one data.table column function from other data.table

I am new to data.table, and am trying to switch over. I have 2 data.tables (variable_sites and dt_bam) and want to use variable_sites$POS (call this refPOS) to perform a function using data from dt_ba...
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user2814482

r

data.table

Votes: 0

Answers: 1

Latest Answer

This is the data.table approach you are looking for. We create a temporary variable end in dt_bam and then perform a non-equi join. Note that when performing the join, you MUST use x.POS to refer to v...
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ekoam

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