Data structures

In-class coding

Make a sequence from 0 to 100 in steps of 10.

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Create a repetition of “yes” and “no” with 10 instance of each, alternating between the two. Then make one with 10 “yes” and then 10 “no”.

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Add the argument n = 10 to head(mtcars). What does this do?

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Extra coding practice

Vectors

Create a vector called dog_names with the values Bella, Daisy, and Max.

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Create a vector called sex with the values Female, Male, and Male.

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Use the index operator to print to console only Daisy and Max from dog_names.

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Replace the Daisy entry with Luna and print dog_names to console.

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Lists

Copy/paste and run this code: (mylist <- list(a = 1:4, b = c(4, 3, 8, 5), c = LETTERS[10:15], d = c("yes", "yes")))

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Check the data types for each list element individually.

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Check the data types for each list element with one command.

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Combine list elements a and b into a single vector.

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Data frames

Create a data frame called mydf with three columns: x, y, and z and five rows. For x assign any five numbers, for y assign any five character strings, and for z assign any five logical values.

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Create a data frame called dogs that combines the dog_names and sex vectors and print to console.

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Print to console just Luna’s row.

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Print to console the number of rows in dogs.

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