hadley

hadley has asked 13 questions and find answers to 432 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

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)?
generate variable names (something like get())
how do tell if its better to standardize your data matrix first when you do principal component analysis in R?
plyr summarize only calls global functions