nycflights13 | R data package containing all out-bound flights | Map library

There is a folder 'C:\tmp_flights.df' that created by disk.frame package , how to import the data into R environment again ? Thanks!

Below code created the disc.frame folder

What is the best way to get a count of all classes in a dataframe?

I know that I could use a combination of lapply and table, but wondering if there are better ways. I am looking for an output like below.

I am basic R user.However I cannot create the plot which shows the daily minimum temperature (in F) of the weather dataset, which is given in nycflights13. I need tocreate a new column called date with str_c, such that date should be given as follows "YYYY-MM-DD".I use the lubridate package but it gives error.

Someone has explanation for that?

I am trying to find the five shortest minimum distances, called min_dist, by origin/destination in the nycflights13 package in R Studio. The result should be a tibble with 5 rows and 3 columns(origin, dest, and min_dist).

I am a beginner and this is what I have so far:

I understand the problem and showed all my work. I'm working through the modern dive data science book (https://moderndive.com/3-wrangling.html#joins book), and got stuck on (LC3.20) at the end of chapter 3.Using the nycflights13 package on R and dplyr, I'm supposed to generate a tibble that has only two columns, airline name and seat miles. Seat miles is just seats * miles. I understand the problem and I thought my code was going to output the correct result, however my seat miles are different for each airline carrier than in the solution. Can someone please help me to figure out why my code went wrong. Additionally, I do understand the books solution, I just don't know why my solution is wrong. I posted all my work.

I'm trying to answer a homework problem, and I'm not very good at R Studio. The problem involves the nycflights13 dataset. The question is, "Using the flights data, identify which airline carrier had the most flights in 2013? Which had the fewest number of flights? Do this using max() and min()."

So far I've used this:

table(nycflights13::flights$carrier)

It's helped me retrieve a frequency table of the carriers. I know United Airlines has the most and Skywest has the least. But how do I prove this using max() and min()? It has only returned the highest and lowest alphabetical values of the carriers. Thank you!

I am new to use functions on lists.

I wrote a function to perform a statistical test over a set of values. I import the set of values as a list into the function as input and run the program. However I observed that the output file have similar output column names. Can we replace/include the input file name in output file column names ?

Here I am attaching a sample code.

I was testing an example from RStudio about "render SQL code" from dbplyr:

I am trying to look up a value of 7 days back from the data but unable to subset the value using dplyr or base R.