1. Announcements

2. Arrays Array – Set of Values with One Name MatLab Creation :
arrayName = [ 1,3,5 ];
Vector – One Dimensional Array
Matrix – Two Dimensional Array
Element – One Member (Value) in an Array
Offset or Subscript – location of an Element in and Array (in MatLab, starting with 1)
Row Vector - “Row” of Values
Column Vector - “Column” of Values

3. Array Element Addition/Subtraction
>> rowV = [ 1, 3, 5 ]
rowV =
>> rowV + 2
ans =
>> rowV - 5

4. Array Element Multiplication/Division
>> rowV * 2
ans =
>> rowV / 2

5. Array Element Exponentiation
>> rowV^2
Error using ^
One argument must be a square matrix and the other must be a scalar. Use POWER (.^) for elementwise power.
>> rowV.^2
ans =

6. Array to Array Operations
>> rowV2 = [ 2, 4, 6]
rowV2 =
>> rowV + rowV2
ans =
>> rowV - rowV2

7. Array to Array Operations
>> rowV * rowV2
Error using *
Inner matrix dimensions must agree.
>> rowV .* rowV2
ans =

8. Array Functions – max(), min()
>> max(rowV)
ans = 5
>> min(rowV) 1

9. Array Functions – length(), size()
length() - Number of Elements in Vector
size() - Returns a vector [NumRows, NumCols]
>> length(rowV)
ans = 3
>> size(rowV)

10. Array Functions – sum()
>> sum(rowV)
ans = 9
>> sum(rowV2) 12

11. Matrices Matrix – Two Dimensional Array MatLab Creation :
matrixName = [ 1,3,5;2,4,6 ];
Row – Horizontal Values
Column – Vertical Values
Element – One Member (Value) in an Array
Offset or Subscript – For Matrix, given as Row, Column Pair (e.g., matrixName(1,2) )

12. Matrix Creation >> matrixOne = [1,2,3;3,4,5];
>> disp(matrixOne)
>> rowV = [9, 10];
>> rowV2 = [11,12];
>> matrixTwo = [rowV;rowV2];
>> disp(matrixTwo)

13. Matrix Creatix (Cont) >> matrixThree = [matrixTwo; matrixTwo];
>> disp(matrixThree)
>> matrixThree = [matrixTwo, matrixTwo];

14. Matrix Creation (Cont)
>> disp(matrixOne)
>> disp(matrixTwo)
>> matrixFour = [matrixOne;matrixTwo];
Error using vertcat
Dimensions of matrices being concatenated are not consistent.
>> matrixFour = [matrixOne,matrixTwo];
>> disp(matrixFour)

15. Matrix Addressing >> disp(matrixFour) 1 2 3 9 10 3 4 5 11 12
>> disp(matrixFour(1,1)) 1
>> disp(matrixFour(2,5)) 12
>> disp(matrixFour(-3,1))
Subscript indices must either be real positive integers or logicals.
>> disp(matrixFour(1,1000))
Index exceeds matrix dimensions.
>> matrixFour(1,7) = 1000;

16. Matrix Addressing (Cont)
Colon (:) means “all” or range
>> disp(matrixFour)
>> disp(matrixFour(:,4)) 9 11
>> disp(matrixFour(2,:))

17. Matrix Addressing (Cont)
>> disp(matrixFour)
>> disp(matrixFour(:,2:5))

18. Matrix Scalar Operations
>> disp(matrixFour)
>> disp(matrixFour + 2)
>> disp(matrixFour * 2)

19. Matrix Transposition >> disp(matrixThree) 9 10 9 10 11 12 11 12
>> disp(matrixThree')

20. Exam 2 Everything Through Quiz 2 if/then switch/case while loops
for loops
Functions
function result = doThis(parameter1, parameter2)
Arrays
Creation
Access
Scalar Element to Element Operations
Array to Array Operations
max(), min(), length(), size(), sum()