Bigmatrix - FIFA World Cup 2014 - IT Assignment Help

Assignment Task:

Problem 2: Go to folder “Data” on Blackboard and find the dataset “bigmatrix”. 

1. Use the function read.table to import the matrix stored in “bigmatrix” into R. Make sure you assign it to some variable for further usage. It will take a couple of seconds for R to read it. 

2. Use the function dim to report the number of rows and the number of columns of the matrix. 

3. Report the means of the first 10 columns (so we have 10 means). (Hint: Indexing the submatrix first then use function colMeans ) 

4. Report the maximum of first 10 rows (so we have 10 maximums). (Hint: Indexing the submatrix first then use function apply ) 

Problem 3: The famous data set iris which gives the measurements in centimeters of the variables sepal length and width and petal length and width, respectively, for 50 flowers from each of 3 species of iris is available in R. Type iris directly to see what it looks like. 

1. Selecting the observations (rows) whose Species are setosa. 

2. Selecting the observations whose Speices are either versicolor or virginica. 

3. Selecting the observations whose Sepal.Length are greater than 4.5 but less than 6.0. 

4. Combine the data frames you got in part 1 and part 3 to one data frame. 

5. Obviously there are some duplicated observations in the data frame you obtained in part 4. Use the command ?unique to learn the usage of the function unique and then utilize it to remove duplicated rows from the data frame you obtained in part 4. 

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