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How-to guide

How to write a good R question with a reproducible example

This article is largely written based on https://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example When posting a question to Stack Overflow, you should include a minimal ...

anon

created Aug 28, 2023 at 18:58

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R Language Frequently Asked Questions

The questions that get asked repeatedly, gathered together in one place. What’s a question every R programmer asks at some point? Add it here! Grab questions from the r-faq tag to get them added ...

Berthold♦

answered Aug 2, 2023 at 17:39

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Download satellite data using http::GET but the files are incomplete

I'm trying to download lots of satellite data from a government website. When I download each file individually, by manually clicking the download button on the site, the files are about 13 MB each. ...

Jonathan Thayn

asked 4 hours ago

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Pairwise T-test for Welch's F ANOVA

I need help with pairwise comparison following Welch's F test. For your convenience, my minimal example is drawn from the example given in the R documentation. df <- ToothGrowth df$dose <- as....

Tyrone

asked 4 hours ago

-1 votes

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Query about DSEq2 package in R

I'm facing a problem to construct a DESeqDataSetFromMatrix data object. The code was dds <- DESeqDataSetFromMatrix ( + countData = counts_data, + colData = col_data, + design = ~dex + ) # Error in ...

r2evans

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modified 9 hours ago

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Repeated measures in RDA (aka "fixed" or "random" effects): why does Condition remove the contraints?

I'm running an RDA on a set of measures that have been taken in a landscape. For each landscape window, we've some parameters that describe the landscape there, and we've conducted, say, 10 measures ...

Jos

modified 17 hours ago

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Customize flextable XML in Word documents using officer and flextable with new versions

I've extensively worked with older versions of the officer and flextable packages in R to create Word documents with tables. To achieve custom table formatting beyond the packages' default ...

TobiSonne

1,117

asked 18 hours ago

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Create a string from data in a dataframe column in R

I have a dataset which I am trying to validate. I created a column that contains the written rules for what to check for each row and would like to use paste0 to concatenate the data in that column ...

r2evans

163k

answered 5 hours ago

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The documentation might be a little misleading. It says Usage: validator(..., .file, .data) Arguments: ...: A comma-separated list of validating expressions .file: (optional) A ...

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r2evans

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Why does `tapply` give a different result depending on the parameter of FUN

I am working on data analysis and came across the following. Given a triplet data frame, consisting of indices i, j and value v, create a matrix m[i, j] = v. A matrix element can have multiple values. ...

clp

1,592

modified 5 hours ago

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When FUN= returns a scalar for all calls, then the default of simplify=TRUE means that it is turned into a vector, non-indexed positions are assigned NA as an indicator of missingness, and this vector ...

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r2evans

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answered 12 hours ago

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How can I set "cr" as the default basis type in mgcv::gam instead of "tp"?

I'm using the mgcv package in R to build generalized additive models (GAMs), and I often use cubic regression splines (cr) instead of the default thin plate regression splines (tp) (mainly because cr ...

Allan Cameron

175k

modified 7 hours ago

Answer

The function s is defined with bs = "tp" as a default argument. There aren't any settings anywhere that can change this. Furthermore, you can't even define a wrapper of s because of how gam ...

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Allan Cameron

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answered 12 hours ago

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How to functionalize base R function like `with()`?

I am trying to write a function that operates similarly to with() where the function has a data argument, and two other arguments that I would like evaluated in the context of the data frame. I ...

G. Grothendieck

272k

answered yesterday

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You are on the right track with rlang::inject(). But note that the documentation states that You can use {{ arg }} with functions documented to support quosures. Otherwise, use !!enexpr(arg). So let’...

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Konrad Rudolph

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answered yesterday

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re-order factors on y axis of a gantt chart

I am trying to produce a Gantt chart with the locations on the y axis in alphabetical order but nothing I tried worked out. Here is the code: gantt <- read_excel("2025-05-07_gantt_chart.xlsx&...

Allan Cameron

175k

modified yesterday

Answer Accepted

The y axis is in alphabetical order, but factor ordering is such that earlier letters in the alphabet get the lowest values, so when these are plotted they are lower on the y axis. Therefore the order ...

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Allan Cameron

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answered yesterday

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How to make a great R reproducible example

When discussing performance with colleagues, teaching, sending a bug report or searching for guidance on mailing lists and here on Stack Overflow, a reproducible example is often asked and always ...

jay.sf

75.5k

modified Apr 2 at 9:39

1511 votes

21 answers

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Sort (order) data frame rows by multiple columns

I want to sort a data frame by multiple columns. For example, with the data frame below I would like to sort by column 'z' (descending) then by column 'b' (ascending): dd <- data.frame(b = factor(c(...

Melanie Shebel

2,928

modified Jul 16, 2024 at 4:37

988 votes

30 answers

2.2m views

How do I replace NA values with zeros in an R dataframe?

I have a data frame and some columns have NA values. How do I replace these NA values with zeroes?

Antreas Stefopoulos

answered Feb 17 at 14:12

1050 votes

25 answers

2.0m views

Drop data frame columns by name

I have a number of columns that I would like to remove from a data frame. I know that we can delete them individually using something like: df$x <- NULL But I was hoping to do this with fewer ...

Quinten

answered Aug 26, 2022 at 17:16

1570 votes

14 answers

1.9m views

How to join (merge) data frames (inner, outer, left, right)

Given two data frames: df1 = data.frame(CustomerId = c(1:6), Product = c(rep("Toaster", 3), rep("Radio", 3))) df2 = data.frame(CustomerId = c(2, 4, 6), State = c(rep("Alabama&...

Melanie Shebel

2,928

modified Feb 3 at 8:58

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How-to guide

How to write a good R question with a reproducible example

anon

created Aug 28, 2023 at 18:58

20 votes

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3 minute read

How-to guide

Create multiple PDF/HTML reports using R Markdown in a loop

How to create multiple PDF/HTML reports in a loop using R Markdown With R Markdown, creating a PDF or HTML report is straightforward. But what if you want to create various reports? Furthermore, what ...

Guibor Camargo Salamanca

created Apr 18, 2023 at 17:48

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