Michael

Michael has asked 18 questions and find answers to 15 problems.

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Spatial predictive modeling, epidemiology, and database processes.

Michael questions

Spacing of discrete axis by a categorical variable
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

Michael answers

Join data but ignore missing values
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