R basics: Dataframe, for loop and if condition

Question 1

what are data frames used for?

Answer 1

used to store structured data in tabular format similar to a spreadsheet

Question 2

what do columns contain?

Answer 2

each column can contain data of different types, numbers, text, dates etc.

Question 3

what do rows contain?

Answer 3

each row is associated with a unique index or identifer.

Question 4

what are dimensions?

Answer 4

dimensions are represented as the number of rows and columns.

Question 5

what is the code for dimensions?

Answer 5

dim()

Question 6

what is a for loop

Answer 6

a for loop is used to iterate over a sequence of elemts and perfomr a set of operations repeatedly

a for loop is a control structure that allows you to execute a block of code multiple times

Question 7

what are the three main components of for loops?

Answer 7

Initialization: you specify a variable and set its initial value. this variable is used as a counter during the loop

iteration: After each iteration of the loop, the counter variable is updated according to specified increment or decrement.