Ryan Watts romans127

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romans127 / Avoiding a loop.R

Created October 23, 2017 18:05 — forked from dsparks/Avoiding a loop.R

lapply() as an alternative to a multiply-nested loop

	# Alternative to a doubly-nested loop
	# Imagine I want to perform an operation on a data frame
	# once for each combination of two variables, such as Country and Year
	# I can do this with a nested loop, or I can do this with (among other
	# things) lapply()

	# Generate random data:
	allCountries <- LETTERS[1:10]
	allYears <- 1990:2012

romans127 / Avoiding a loop.R

Created October 23, 2017 18:05 — forked from dsparks/Avoiding a loop.R

lapply() as an alternative to a multiply-nested loop

	# Alternative to a doubly-nested loop
	# Imagine I want to perform an operation on a data frame
	# once for each combination of two variables, such as Country and Year
	# I can do this with a nested loop, or I can do this with (among other
	# things) lapply()

	# Generate random data:
	allCountries <- LETTERS[1:10]
	allYears <- 1990:2012