Scala Data Analysis Cookbook

Working with matrices

As we discussed in the Working with vectors recipe, you could use the Eclipse or IntelliJ IDEA Scala worksheets for a faster turnaround time.

How to do it...

There are a variety of functions that we have in a matrix. In this recipe, we will look at some details around:

• Creating matrices:
  • Creating a matrix from values
  • Creating a zero matrix
  • Creating a matrix out of a function
  • Creating an identity matrix
  • Creating a matrix from random numbers
  • Creating from a Scala collection
• Matrix arithmetic:
  • Addition
  • Multiplication (also element-wise)
• Appending and conversion:
  • Concatenating a matrix vertically
  • Concatenating a matrix horizontally
  • Converting a matrix of Int to a matrix of Double
• Data manipulation operations:
  • Getting column vectors
  • Getting row ...