MichaelChirico

MichaelChirico has asked 78 questions and find answers to 198 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

Multiple pairwise differences based on column name patterns
Fill missing column values depending on values in preceding row
Invalid first argument in get when using data.table in lapply
R data table: Why are values of concatenated list lost?
Find Fortran file used in R package
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