Recent questions and answers in Data Handling

0 votes

2 answers

31 views

The function read.csv() imports data into

answered Nov 20 in Data Handling by anonymous

0 votes

2 answers

27 views

Applying lapply function on a matrix returns

answered Nov 7 in Data Handling by anonymous

+1 vote

2 answers

43 views

If x and y are two tbls, which of the following joins return all rows from x and y irrespective of matching values?

answered Oct 29 in Data Handling by anonymous

0 votes

2 answers

59 views

A hospital data contains patient's age and treatment they are undergoing. Which function can be used to find average of patients undergoing each of the treatments?

answered Oct 14 in Data Handling by anonymous

+1 vote

2 answers

28 views

Which of the following functions lists all columns in a dataset with few values from each column?

answered Oct 12 in Data Handling by anonymous

+1 vote

2 answers

26 views

Which of the following functions can be used to find the number or rows and columns in a dataset?

answered Oct 11 in Data Handling by anonymous

0 votes

2 answers

35 views

Which function is used over the margins of an array

answered Sep 28 in Data Handling by anonymous

+1 vote

2 answers

39 views

dplyr never prints row names since no dplyr method is guaranteed to preserve them.

answered Sep 26 in Data Handling by anonymous

+1 vote

2 answers

53 views

Which of the following functions does not list the total number of observations in a dataset?

answered Sep 24 in Data Handling by anonymous

0 votes

0 answers

7 views

asked Sep 3 in Data Handling by Robin (1k points)

+1 vote

1 answer

33 views

In the mtcars dataset, how many cars provide a mileage of less than 20 mpg?

answered May 27 in Data Handling by tempuser (197 points)

+1 vote

1 answer

26 views

In the iris dataset, how many flowers havePetal.Length/Petal.Width ratio of less than 10

answered May 27 in Data Handling by tempuser (197 points)

+1 vote

1 answer

122 views

In the iris dataset, how many flowers of species setosa havePetal.Length/Petal.Width ratio of less than 10.

answered May 27 in Data Handling by tempuser (197 points)

+1 vote

1 answer

31 views

What is the average mileage of a car in the mtcars dataset

answered May 27 in Data Handling by tempuser (197 points)

+1 vote

1 answer

30 views

In the hflights dataset, how many flights were cancelled in the month of January 2011

answered May 27 in Data Handling by tempuser (197 points)

+1 vote

1 answer

20 views

dplyr is useful for:

answered May 27 in Data Handling by tempuser (197 points)

0 votes

1 answer

22 views

tbl is an extension of:

answered May 27 in Data Handling by tempuser (197 points)

+1 vote

1 answer

34 views

Which command can be used to import text files in R

answered May 27 in Data Handling by tempuser (197 points)

+1 vote

1 answer

27 views

nrows and skip arguments in the read.table() command can be used to get

answered May 27 in Data Handling by tempuser (197 points)

+1 vote

1 answer

37 views

The function write.csv() exports data into a file. However, this function by default adds rownames to the file. Which argument can be used to turn off addition of rownames?

answered May 27 in Data Handling by tempuser (197 points)

0 votes

1 answer

23 views

Which package is used to import data from a SQL server to R?

answered May 27 in Data Handling by tempuser (197 points)

0 votes

1 answer

27 views

For a given matrix mat, how do you increment every element of the matrix by 3 and return a vector. (I) sapply(mat, function(x,y) sum(x)+y,y=3) (II) sapply(mat, function(x) sum(x)+3)

answered May 27 in Data Handling by tempuser (197 points)

0 votes

1 answer

43 views

What will the following lines of code return x <- matrix(1:18, 6, 3) apply(x, 2, sum)

answered May 27 in Data Handling by tempuser (197 points)

0 votes

1 answer

14 views

Which function is very similar to lapply?

answered May 27 in Data Handling by tempuser (197 points)

0 votes

1 answer

23 views

Which function can be used when a vector needs to be split into groups defined by a classifying factor, compute a function on the subsets, and return the results?

answered May 27 in Data Handling by tempuser (197 points)

Help get things started by asking a question.

...