 # ENGR 328 Computational Methods in Engineering HW Anonymous

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Super_Teach12
School: Duke University  Hi, here is your assignment :) Together with the m files :)

ENGR 328 Homework 5
1. A number of matrices are defined as:

%
%
%
%
%

Answer the following questions regarding these matrices:
(a) What are the dimensions of the matrices?
(b) Identify the square matrices, column vectors, and row vectors.
(c) What are the values of the elements: a12, b23, d32, e22, f12, g12?
(d) Perform the following operations:

A. Code:
(a) What are the dimensions of the matrices?
A = [4 7; 1 2; 5 6]
[m,n] = size(A)
Output:

B. Code:
%B. Identify the square matrices, column vectors, and row
vectors.
%
Square matrix are those with equal number of rows and
columns
%
Below is code for checking square matrix A = [4 7; 1 2; 5 6]
[m,n] = size(A)
if m == n
disp('A is square matrix');
else
disp('A is not a square matrix');
end
B = [4 3 7; 1 2 7; 2 0 4]
[m,n] = size(B)
if m==n
disp('B is square matrix');
else
disp('B is not square matrix');
end
Output:

C. Code:
% c) What are the values of the elements: a12, b23, d32, e22,
f12, g12?
A = [4 7; 1 2; 5 6]
[m,n] = size(A)
A(1,2)
B=[4 3 7;1 2 7;2 0 4]
B(2,3)
D=[9 4 3 -6;2 -1 7 5]
D(3,2)
Output:

D. Code:

Output:
B=
4

3

7

1

2

7

2

0

4

9

4

3

-6

2

-1

7

5

1

5

8

7

2

3

4

0

6

C=
3
6
1
D=

E=

ans =
5

8 15

8

...

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