PHP interview questions part 7
PHP interview questions part 7
Take as many assements as you can to improve your validate your skill rating
Total Questions: 20
1. which of the following statement tells the row with the minimum value for every column ?
Correct Answer is : 448
2. Which of the following may be used for linear regression ?
Correct Answer is : testvalue
3. Which of the following sets the size of the outer margins for the graph ?
Correct Answer is : error
4. Which of the following function is used for plotting histogram ?
Correct Answer is : Invalid
5. Which of the following will add the title “R language” to the graph ?
Correct Answer is : String
6. Individual R objects can be saved to a file using the _____ function.
Correct Answer is : E
7. Which of the following statement will save the output to the file for following code ? > a <- data.frame(x = rnorm(100), y = runif(100)) > b <- c(3, 4.4, 1 / 3)
Correct Answer is : Complete text representation of month
8. Which of the following statement will load the objects to the file named “mydata.RData” ?
Correct Answer is : Today is June 22, 2013
9. ________ opens a connection to a file compressed with gzip.
Correct Answer is : mktime()
10. Connections to text files can be created with the ________ function.
Correct Answer is : getlastmod()
11. Which of the following code creates a connection to ‘foo.txt’ ?
Correct Answer is : 30
12. Which of the following code opens a connection to the file foo.txt, reads from it, and closes the connection when its done ?
Correct Answer is : strtotime(“+45 days”)
13. .Which of the following opens connection to gz-compressed text file ?
Correct Answer is : $date = new DateTime(“22 JUNE 2013”)
14. What would be the result of following R code ? > x <- 1 > print(x)
Correct Answer is : Hello world
15. Which of the following code is example of explicit printing ?
Correct Answer is : Hello world I am learning PHP
16. Files containing R scripts ends with extension :
Correct Answer is : Thiswasabadidea
17. If commands are stored in an external file, say commands.R in the working directory work, they may be executed at any time in an R session with the command :
Correct Answer is : Thiswasabadidea
18. _______ will divert all subsequent output from the console to an external file.
Correct Answer is : Thiswasbadidea
19. The entities that R creates and manipulates are known as ________
Correct Answer is : HelloWorld
20. Which of the following can be used to display the names of (most of) the objects which are currently stored within R ?
Correct Answer is : HelloWorld
