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The function call, rnorm(1), generates a normal random number. Use replicate() to generate 10 normal random numbers and assign them to a vector called nums
- The function call, rnorm(1), generates a normal random number. Use replicate() to generate 10 normal random numbers and assign them to a vector called nums.
- The R statement, data(iris), loads the built-in R data set iris. This dataset has 150 rows and 5 columns. The 5 column names are "Sepal.Length","Sepal.Width","Petal.Length","Petal.Width" and "Species".
- Write R code(s) to return a list of 4 items that correspond to the averages of the first 4 columns in iris. The contents of the list should be as follows: $Sepal.Length [1] 5.843333 $Sepal.Width [1] 3.057333 $Petal.Length [1] 3.758 $Petal.Width [1] 1.199333
- With the iris dataset still loaded,
- write R code(s) to return a vector of 4 items that correspond to the averages of the first 4 columns in iris. The contents of the vector should be as follows:
Sepal.Length | Sepal.Width | Petal.Length | Petal.Width |
5.843333 | 3.057333 | 3.7580000 | 1.199333 |
- The following R code converts the contents of the first 4 columns in iris to a matrix called data. data=as.matrix(iris[,1:4])
- Write R code(s) to use apply() to return a vector that contains the max values of the 4 columns. The contents of the vector should be as follows [Hint, use max()]:
Sepal.Length | Sepal.Width | Petal.Length | Petal.Width |
7.9 | 4.4 | 6.9 | 2.5 |
- Write R code(s) to read the contents of the provided file COS-206-ShoppingCart.html into a variable called cart and then show the first 5 lines of cart.
#5 provided below html
Table for Shopping Cart
Item | Code | Price | Quantity | Amount |
---|---|---|---|---|
Hand Shovel | G01 | 4.99 | 1 | 4.99 |
Nice Saw | H01 | 24.99 | 1 | 24.99 |
Subtotal: | 29.98 |
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