R For Dummies

Chapter 7

Working in More Dimensions

In This Chapter

Creating matrices

Getting values in and out of a matrix

Using row and column names in a matrix

Performing matrix calculations

Working with multidimensional arrays

Putting your data in a data frame

Getting data in and out of a data frame

Working with lists

In the previous chapters, you worked with one-dimensional vectors. The data could be represented by a single row or column in a Microsoft Excel spreadsheet. But often you need more than one dimension. Many calculations in statistics are based on matrices, so you need to be able to represent them and perform matrix calculations. Many datasets contain values of different types for multiple ...