Indexing and Filtering

Vector Indexing

R uses 1-based indexing -- the first element is at position 1, not 0:

x <- c(10, 20, 30, 40, 50)
cat(x[1], "\n")  # 10
cat(x[3], "\n")  # 30
cat(x[5], "\n")  # 50

Selecting Multiple Elements

Pass a vector of indices to select multiple elements:

x <- c(10, 20, 30, 40, 50)
cat(x[c(1, 3, 5)], "\n")  # 10 30 50
cat(x[2:4], "\n")          # 20 30 40

Negative Indexing

Use negative indices to exclude elements:

x <- c(10, 20, 30, 40, 50)
cat(x[-1], "\n")       # 20 30 40 50 (exclude first)
cat(x[-c(2, 4)], "\n") # 10 30 50 (exclude 2nd and 4th)

Logical Filtering

Use a logical vector to filter elements:

x <- c(3, 7, 1, 9, 4)
cat(x[x > 4], "\n")    # 7 9
cat(x[x %% 2 == 1], "\n") # 3 7 1 9 (odd numbers)

The expression x > 4 creates a logical vector c(FALSE, TRUE, FALSE, TRUE, FALSE), which is then used to select elements.

Your Task

Create a vector with the values 12, 5, 8, 19, 3, 15. Use logical filtering to print only the values greater than 10.