R programming question
Why do these codes represent the same output.
I want a thorough insight into this coding cuz Im a newbee in coding
1.
many_airports %
filter(dest == "SEA" | dest == "SFO" | dest == "PDX" |
dest == "BTV" | dest == "BDL")
2.
many_airports %
filter(dest %in% c("SEA", "SFO", "PDX", "BTV", "BDL"))
View(many_airports)
by 
Willwolf
ANSWERS: 1
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I don't know what "R" programming is. But, based on the commands, and applying general computational ideas (looks like S Code to me), the first filters through by comparing "dest" to individual strings one at a time, and the second looks for "dest" by comparing it with the elements of a 1d matrix. The first method isn't as good if you are iterating or repeating the procedure a lot, because it used a tiny bit more time for the processor to keep pushing things through a narrow bottleneck in the memory. The second method opens up that bottleneck, but uses more memory in the process.
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