hadley

hadley has asked 13 questions and find answers to 435 problems.

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I'm chief scientist at RStudio.

hadley questions

Working with rich objects in data.table columns
Combined aggregated and non-aggregate query in SQL
ActiveRecord::StatementInvalid: Could not find table 'tablename'
Efficiently locate group-wise constant columns in a data.frame
Determine if a transaction is active (Postgres)
Blinding a latex paper
Automatically escape unicode characters
Which packages make good use of S4 objects?
Preventing performance regressions in R
Perform a semi-join with data.table

hadley answers

Posting to and Receiving data from API using httr in R
Suppressing 302 Error returned by httr POST
Can one extract model fit parameters after a ggplot stat_smooth call?
ggplot + geom_point + legend based on both size and color
Down sampling a time series data in dplyr from Postgres DB
Advantages of purrr vs apply family [duplicate]
Logistic Regression in R (SAS-like output)
Assign attributes with C++ to an arbitrary R object?
How specify join variables with different names in different MySQL tables
How to get the difference in value between subsequent observations (country-years)?