Vectors, Arrays, and Matrices in R

Front

What are the different R variable types?

Back

Integer, numeric (floating-point number), character (string), logical (Boolean), complex.

Front

How are vectors stored in R?

Back

Vectors are stored like arrays in C, contiguously.

Front

Can you insert or delete elements in a vector in R?

Back

No, the size of a vector is determined at its creation.

Front

How do you add an element to the middle of a vector in R?

Back

Use the c() function to combine parts of the vector with the new element.

Front

What function is used to obtain the length of a vector in R?

Back

The length() function.

Front

What is the result of the expression length(c(1,2,4))?

Back

3.

Front

What does the function first1 do?

Back

It returns the index of the first occurrence of the value 1 in a vector.

Front

What happens when you apply an operation to two vectors of different lengths in R?

Back

R automatically recycles the shorter vector.

Front

What is the result of c(1,2,4) + c(6,0,9,20,22)?

Back

7 2 13 21 24.

Front

How do you extract specific elements from a vector in R?

Back

Use indexing with square brackets, e.g., y[c(1,3)].