Michael

Michael has asked 16 questions and find answers to 14 problems.

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Spatial predictive modeling, epidemiology, and database processes.

Michael questions

Memory profiling with data.table
Arranging ggplot multiple objects maintaining while constant height
Fastest way to drop rows with missing values?
Passing an entire package to a snow cluster
why does as.vector deep copy a matrix?
safely turn a data.table back into a data.frame
Insert a linebreak in title
Why is expand.grid faster than data.table 's CJ?
Printing multiple ggplots into a single pdf, multiple plots per page
Writings functions (procedures) for data.table objects

Michael answers

subset slow in large matrix
Using clustered covariance matrix in predict.lm()
Why is expand.grid faster than data.table 's CJ?
data.table function per row too slow
Equivalent to ddply(...,transform,...) in data.table
regarding matrix comparison in R
Is there a shorter way to extract a date from a string?
override S3 methods in base R
Merge overlapping ranges into unique groups, in dataframe
How to use an unknown number of key columns in a data.table