MichaelChirico

MichaelChirico has asked 77 questions and find answers to 193 problems.

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About

R, Python, Spark, Presto, Julia, QGIS, SAGA, STATA, MATLAB neophyte.

http://michaelchirico.github.io/

MichaelChirico questions

Conditional keyed join/update _and_ update a flag column for matches
Using colClasses and select arguments of fread simultaneously
Is Variable.get('x', deserialize_json=True) the same as Jinja '{{ var.json.x }}'?
How to define custom CSS within the document?
dcast renaming all variables to start with a number
Why is it faster to evaluate in `j` than with `$` in a `data.table`?
How does RStudio determine the console width, and why does it seem to be getting it consistently wrong?
Assignment via `:=` in a for loop (R data.table)
Why do which and Sys.which return different paths?
Removing "NUL" characters (within R)

MichaelChirico answers

Generate random numbers in an R dataframe which are constant across similar-rows
Transform data.table with ranges of codes
assign the same value to multiple variables
X[Y] join syntax with the 'on' argument
How to set spaces in the column names of a table or data frame using xtable
System date in Posixlt and Posixct
Using colClasses and select arguments of fread simultaneously
R data.table return NA when using .I to get row number
Use dynamic names for CJ in data.table
Accessing a vector element by name in R when some names are duplicated