Recent questions tagged R

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r - How to directly select the same column from all nested lists within a list?

is it possible to directly select a column of all nested lists within a list? My list is created using aggregate( ... way? 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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334 views

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r - How do you remove columns from a data.frame?

Not so much 'How do you...?' but more 'How do YOU...?' If you have a file someone gives you with 200 ... so you can easily grab what you want? See Question&Answers more detail:os...

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

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r - Add objects to package namespace

I'd like to push a function inside a package namespace so it can access internal objects of that package (let's use ... 't unlock it. Any 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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r - What is the significance of the new Reference Classes?

Apparently John Chambers added Reference Classes to R in version 2.12. There doesn't appear to be much ... in with existing class types? See Question&Answers more detail:os...

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

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507 views

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r - Creating a Plot Window of a Particular Size

How can I create a new on-screen R plot window with a particular width and height (in pixels, etc.)? See Question&Answers more detail:os...

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

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328 views

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r - Convert all data frame character columns to factors

Given a (pre-existing) data frame that has columns of various types, what is the simplest way to convert all ... this process a bit more? See Question&Answers more detail:os...

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

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626 views

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r - Text clustering with Levenshtein distances

I have a set (2k - 4k) of small strings (3-6 characters) and I want to cluster them. Since I use ... MATLAB or R with a custom function? See Question&Answers more detail:os...

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

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433 views

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r - How to randomize (or permute) a dataframe rowwise and columnwise?

I have a dataframe (df1) like this. f1 f2 f3 f4 f5 d1 1 0 1 1 1 d2 1 0 0 1 0 d3 0 ... to my previous question on randomizing two columns. See Question&Answers more detail:os...

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

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r - How to increase the space between the bars in a bar plot in ggplot2?

How can I increase the space between the bars in a bar plot in ggplot2 ? See Question&Answers more detail:os...

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

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473 views

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r - RMarkdown: How to change the font color?

In RMarkdown is there a way to specify the font color? There doesn't seem to be an option while browsing through the chunk options See Question&Answers more detail:os...

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

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322 views

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r - Extracting time from POSIXct

How would I extract the time from a series of POSIXct objects discarding the date part? For instance, I have: ... would allow me to do that? See Question&Answers more detail:os...

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

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408 views

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r - Inserting a table under the legend in a ggplot2 histogram

Is there anyway to get grid.arrange() to act as split.screen ()? I would like to arrange a table to ... type graphics. Any suggestions? Thanks. See Question&Answers more detail:os...

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

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426 views

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r - ggplot2 plot area margins?

Is there an easy way to increase the space between the plot title and the plot area below it (the box with the ... x axis title a bit down"? See Question&Answers more detail:os...

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

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451 views

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r - Reproducing lattice dendrogram graph with ggplot2

Is this possible to reproduce this lattice plot with ggplot2? library(latticeExtra) data(mtcars) x <- t(as.matrix(scale( ... ", size = 10)))) See Question&Answers more detail:os...

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

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328 views

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r - ggplot2 heatmaps: using different gradients for categories

This Learning R blog post shows how to make a heatmap of basketball stats using ggplot2. The finished heatmap ... offensive, defensive, other)? See Question&Answers more detail:os...

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

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277 views

1 answer

r - How to sort a data frame by date

I need to sort a data frame by date in R. The dates are all in the form of "dd/mm/yyyy". The dates are ... order to sort the data frame by date. See Question&Answers more detail:os...

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

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438 views

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r - What is the difference between gc() and rm()

I am periodically cleaning the memory in R using a call to rm(list=ls()). Do I need to call the garbage ... ) call rm() for certain variables? See Question&Answers more detail:os...

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

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621 views

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r - Merge Multiple spaces to single space; remove trailing/leading spaces

I want to merge multiple spaces into single space(space could be tab also) and remove trailing/leading spaces. ... space in toy string. Thanks See Question&Answers more detail:os...

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

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366 views

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r - Elegantly assigning multiple columns in data.table with lapply()

I am trying to figure out an elegant way to use := assignment to replace many columns at once in a data.table by ... := lapply(eval(l), sqrt)] See Question&Answers more detail:os...

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

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419 views

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r - SQL Server RODBC Connection

Does anyone have a connection string example for using RODBC and connecting to MS SQL Server 2005 or 2008. Thank you. See Question&Answers more detail:os...

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

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505 views

1 answer

r - How to reorder data.table columns (without copying)

I'd like to reorder columns in my data.table x, given a character vector of column names, neworder: library( ... there another 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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382 views

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r - Select columns based on string match - dplyr::select

I have a data frame ("data") with lots and lots of columns. Some of the columns contain a certain string (" ... IDs from my grepl() expression. See Question&Answers more detail:os...

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

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310 views

1 answer

r - dplyr change many data types

I have a data.frame: dat <- data.frame(fac1 = c(1, 2), fac2 = c(4, 5), fac3 = c(7, 8), ... a more elegant (shorter) way in dplyr? thx Christof See Question&Answers more detail:os...

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

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351 views

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r - Modifying fonts in ggplot2

I am looking for a way to modify font types in ggplot. At the moment I would be happy enough to simply change ... is all easy enough to follow. 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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r - Boxplot show the value of mean

In this boxplot we can see the mean but how can we have also the number value on the plot for every mean of ... =18, size=3,show_guide = FALSE) See Question&Answers more detail:os...

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

0 votes

515 views

1 answer

r - Colour points in a plot differently depending on a vector of values

I'm plotting the plot below using R's plot function. It is a plot of a vector 'shiftTime' of shift in ... values are on the same index? See Question&Answers more detail:os...

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

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504 views

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r - Multiline Comment Workarounds?

I (sort of) already know the answer to this question. But I figured it is one that gets asked so ... Does anyone have a better 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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394 views

1 answer

r - What is the most efficient way to cast a list as a data frame?

Very often I want to convert a list wherein each index has identical element types to a data frame. For example, ... are better 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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