The programing language, R has a unite unite function in the tidyr package. Hence, the code chunk which let's the analyst create the location column is; <em>unite (stores, "location”, city, state, sep=",") </em>
- The syntax for the unite function is ; unite(data,col,..., sep)
- <em>data</em><em> </em><em>=</em><em> </em><em>dataframe</em><em> </em><em>from</em><em> </em><em>which</em><em> </em><em>data</em><em> </em><em>is</em><em> </em><em>to</em><em> </em><em>be</em><em> </em><em>extracted</em><em> </em><em>`</em><em>;</em><em> </em>stores
- <em>col</em><em> </em><em>=</em><em> </em><em>name</em><em> </em><em>of</em><em> </em><em>the</em><em> </em><em>new</em><em> </em><em>column</em><em> </em><em>;</em><em>"</em><em> </em>location"
- <em>.</em><em>.</em><em>.</em><em> </em><em>=</em><em> </em><em>dataframes</em><em> </em><em>to</em><em> </em><em>be</em><em> </em><em>merged</em><em> </em><em>;</em><em> </em>city, state
- <em>sep</em><em> </em><em>=</em><em> </em><em>seperator</em><em> </em><em>;</em><em> </em>","
Hence, the required syntax goes thus :
- unite (stores, "location”, city, state, sep=",")
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Answer: Ill explain it!
Explanation: Modern technology is extremely beneficial to drivers because the modern cars have sensors that detect the range of other cars, when they stop and you might not see or be ready for it, your car will slam the brakes for you, this alone saves many lives. Another is like a Tesla with autopilot. Lets say for example one day your really sleepy or dont feel good, its a stress to keep the car straight. You could turn on autopilot and it could assist you with your driving, and their system has shown to be for the most part very beneficial and responsive. I would say another would be cameras above traffic lights watching for speeders and getting their license plates. This is important because people who are being risky and causing hazards on the road will get a fat ticket and will be seeing court. They are less likely to run a red light if they see a camera watching. I hope this helps you!
The reason why computers has the need to periodically check
for the DNS of websites that an individual has already visited because certain
websites can change its IP address and that the individual using it can be
directed to a different website that he or she does not know of.
Solution :
Here, we need to perform JOIN operation of the students and registration.
Use NATURAL JOIN operator
and so no need to specify Join condition.
Also we need to selection operator tp select only those course whose major in "philosophy".
Finally we projection operator π to project only distinct students name who took at least three courses.
![$\pi [\sigma_{\text{student's nam}e} [ \sigma(\text{three courses}) \Join \text{"Philosophy"}]]$](https://tex.z-dn.net/?f=%24%5Cpi%20%5B%5Csigma_%7B%5Ctext%7Bstudent%27s%20nam%7De%7D%20%5B%20%5Csigma%28%5Ctext%7Bthree%20courses%7D%29%20%5CJoin%20%5Ctext%7B%22Philosophy%22%7D%5D%5D%24)
Answer:Many animals and plants have become extinct or endangered due to human error. In fact about 1 million species are in danger of becoming extinct. Orangutans are becoming extinct due to deforestation. Too many trees are being cut down leaving them without a way to survive. Carnivorous plants are also at risk due to damaged environment.
Explanation: YWW FRIEND!!