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MichaelChirico
Julia, R, Python, QGIS, SAGA, STATA, MATLAB neophyte.
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Top Questions
87
votes
How exactly does R parse `->`, the right-assignment operator?
r
yacc
asked Jan 4, 2016 at 20:11
stackoverflow.com
45
votes
Read SAS sas7bdat data into R
r
r-faq
asked May 2, 2015 at 19:58
stackoverflow.com
24
votes
Does 左様なら (sayōnara) have Chinese roots?
etymology
greetings
asked Jun 3, 2020 at 8:35
japanese.stackexchange.com
21
votes
Adding a footnote / thanks to Rmarkdown title slide
r
knitr
rmarkdown
pandoc
beamer
asked Feb 5, 2016 at 16:19
stackoverflow.com
21
votes
Installing a package offline from GitHub
r
asked Oct 16, 2015 at 20:36
stackoverflow.com
20
votes
Why do `as` methods remove vector names, and is there a way around it?
r
type-conversion
asked Jan 7, 2016 at 5:00
stackoverflow.com
18
votes
How can I tell which packages I am not using in my R script?
r
packages
asked Apr 2, 2015 at 14:35
stackoverflow.com
18
votes
What is an inch? Setting the length for arrows
r
plot
asked Oct 31, 2017 at 12:00
stackoverflow.com
16
votes
Efficiently counting non-NA elements in data.table
r
data.table
asked Apr 16, 2015 at 19:01
stackoverflow.com
14
votes
Geometric intuition for derivatives of basic trig functions
calculus
geometry
trigonometry
asked May 26, 2015 at 15:44
math.stackexchange.com
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Top Answers
117
What does .SD stand for in data.table in R
stackoverflow.com
99
What to do about students who miss my lectures and then want me to repeat entire material?
academia.stackexchange.com
96
V.I. Arnold says Russian students can't solve this problem, but American students can -- why?
math.stackexchange.com
81
In a right triangle, can $a+b=c?$
math.stackexchange.com
77
Speeding up the performance of write.table
stackoverflow.com
71
Use of lapply .SD in data.table R
stackoverflow.com
56
Read SAS sas7bdat data into R
stackoverflow.com
41
Faster way to read fixed-width files
stackoverflow.com
38
Is the sum of two white noise processes necessarily a white noise?
stats.stackexchange.com
34
Check whether a vector is ascending/descending order
stackoverflow.com
33
Converted xxx-eps-converted-to.pdf not found
tex.stackexchange.com
33
Elegant way to check for missing packages and install them?
stackoverflow.com
29
Did close to 3,000 Puerto Ricans die in Hurricane Maria?
skeptics.stackexchange.com
27
How to quickly form groups (quartiles, deciles, etc) by ordering column(s) in a data frame
stackoverflow.com
27
How do people perform mental arithmetic for complicated expressions?
math.stackexchange.com
27
Find the value of a function whose derivative is zero
math.stackexchange.com
26
Why does it take more time for data.table::fread to read a file when filename is specified differently?
stackoverflow.com
25
Read an Excel file directly from a R script
stackoverflow.com
24
The difference between bracket [ ] and double bracket [[ ]] for accessing the elements of a list or dataframe
stackoverflow.com
22
How can I view the source code for a function?
stackoverflow.com
21
Replace values in a dataframe based on lookup table
stackoverflow.com
21
Lower case for a (factor) data frame column
stackoverflow.com
20
reshape wide to long using data.table with multiple columns
stackoverflow.com
18
Most efficient way of exporting large (3.9 mill obs) data.frames to text file?
stackoverflow.com
18
Select first and last row from grouped data
stackoverflow.com
16
How can I tell which packages I am not using in my R script?
stackoverflow.com
15
What is the difference between extraction via $ and @ in R?
stackoverflow.com
14
Draw lines between all the coordinates in a plot
stackoverflow.com
14
R: By group, test if for each value of one variable, that value exists in another variable
stackoverflow.com
14
How to prevent truncation of error messages in R
stackoverflow.com
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