Matrices

Find B-A

• -3     1
  7     -1

• 1     0
  1     -4

• -4       0
  6     -1

• not possible because rows do not match columns

In Matrix R (pictured) what element is in the second row, third column?

• 8

• 9.01

• 6

• 1

How many columns are in a 5 x 4 matrix?

• 5

• 4

• 20

• 9

In Matrix R (pictured) what is the value of element R_3,2

• 8

• 9.01

• 6

• 1

What is a Matrix?

• An equation of over 5 numbers or symbols

• A set of numbers in rows and columns

• A method of finding the n^th value of a series

• A complicated number system

A (a)   describes the size of the matrix by the number of rows and columns.

• dimension

• entry

• array

• matrix

What is a Matrix?

• An equation of over 5 numbers or symbols 

• A set of numbers in rows and columns

• A method of finding the n^th value of a series

• A complicated number system

The assignment problem is always a ______________matrix

• unit

• square

• rectangle

• triangle

find: B*A

• 47     30
  9     5

• 17     15
  42     35

• 10     25
  7     1

• not possible because rows do not match columns

What are the dimensions of this matrix?

• 2 x 3

• 3 x 2

• 6 x 1

• 1 x 6