r Archives - IT Nursery

Programming, r

IT Nursery

How to interpret dplyr message `summarise()` regrouping output by ‘x’ (override with `.groups` argument)?

I started getting a new message (see post title) when running group_by and summarise() after updating to dplyr development version 0.8.99.9003. Here is ...

June 4, 2022
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Programming, r

IT Nursery

What does .SD stand for in data.table in R

.SD looks useful but I do not really know what I am doing with it. What does it stand for? Why is there ...

June 4, 2022
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Programming, r

IT Nursery

Prevent row names to be written to file when using write.csv

Commands: t <- data.frame(v = 5:1, v2 = 9:5) write.csv(t, "t.csv") Resulting file: # "","v","v2" # "1",5,9 # "2",4,8 # "3",3,7 # "4",2,6 ...

June 4, 2022
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file, Programming

IT Nursery

Find file name from full file path

Is there a way to extract the file name from the file full path (part of a file path) without the hassle of ...

June 4, 2022
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Programming, r

IT Nursery

How to remove all whitespace from a string?

So " xx yy 11 22 33 " will become "xxyy112233". How can I achieve this? 9 Answers 9

June 4, 2022
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Programming, r

IT Nursery

Workflow for statistical analysis and report writing

Does anyone have any wisdom on workflows for data analysis related to custom report writing? The use-case is basically this: Client commissions a ...

June 3, 2022
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Programming, r

IT Nursery

Call apply-like function on each row of dataframe with multiple arguments from each row

I have a dataframe with multiple columns. For each row in the dataframe, I want to call a function on the row, and ...

June 3, 2022
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Programming, r

IT Nursery

Repeat each row of data.frame the number of times specified in a column

df <- data.frame(var1 = c('a', 'b', 'c'), var2 = c('d', 'e', 'f'), freq = 1:3) What is the simplest way to expand each ...

June 3, 2022
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Programming, r

IT Nursery

What do hjust and vjust do when making a plot using ggplot?

Every time I make a plot using ggplot, I spend a little while trying different values for hjust and vjust in a line ...

June 3, 2022
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Programming, r

IT Nursery

Append value to empty vector in R?

I’m trying to learn R and I can’t figure out how to append to a list. If this were Python I would . ...

June 3, 2022
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