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vsbuffalo/integer_types.R

Created February 6, 2011 09:24
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Give R hints when it's working with integers
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integer_types.R
# If you have a long vector of integers to compare against an integer literal,
# specify that the numerical literal is an integer rather than letting
# R coerce the entire vector to doubles.
x <- as.integer(floor(rnorm(1000000, 0, 1000)))
system.time(x < 0)
# user system elapsed
# 0.014 0.000 0.014
system.time(x < 0L)
# user system elapsed
# 0.003 0.000 0.004
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