How to Loop Through a List in R
Simple and effective tips for how to Loop Through a List in R. Explore how simple it is in our complete article.
I have a list lets say:
dataSet$mixed_bag <- list("Hello", c("USA", "Red", "100"), c("India", "Blue", "76"))
I want to iterate through this list and create new variables based on the contents of the list. A pseudo code would look something like this.
foreach row in dataSet$mixed_bag {
if (sapply(dataSet$mixed_bag, length) == 3) {
dataSet$country <- dataSet$mixed_bag[[row]][1];
dataSet$color <- dataSet$mixed_bag[[row]][2];
dataSet$score <- dataSet$mixed_bag[[row]][3];
} else if (sapply(dataSet$mixed_bag, length) == 2) {
#Do something else
} else {
# Do nothing
}
}
Please suggest how would I do this in R
1 Answer
something like this?
dataList <- list("Hello", c("USA", "Red", "100"), c("India", "Blue", "76"))
for(i in dataList)
{print(i)}
returns:
[1] "Hello"
[1] "USA" "Red" "100"
[1] "India" "Blue" "76"
or:
for(i in dataList)
{
for(j in i)
{print(j)}
}
returns:
[1] "Hello"
[1] "USA"
[1] "Red"
[1] "100"
[1] "India"
[1] "Blue"
[1] "76"
James Sterling reports on renewable energy developments, climate policy, ecological conservation, and green tech innovations around the globe.
