Question 2 (a) Write the result of executing the following commands in MATLAB: X

Question

Question 2

(a) Write the result of executing the following commands in MATLAB:

X = [1 [[5] [9, -1]] [3]]

Y = [1:3; 4 4 4]

Z = [4:6; 8:10; 15:19]

[3 marks]

(b) Given the vector Q = [5, 0, 12, 3], write the output after executing

each

of

the following commands:

Q = [Q, 9]

Q(2) = []

Q(end-1) = sum(Q)

[3 marks]

(c) Given a matrix, M:

1 5 9

7 8 7

3 6 2

Write the values in the matrix after

each

of the following commands:

M(1,:) = 7

M([3, 1], [2, 3]) = 0

[3 marks]

(d) Write equivalent code to the one shown below by replacing the

while loop

with a

for loop

.

a = [];

x = 5;

while x <= 15

a[x-4] = x^2;

x = x + 1;

end

[4 marks]

(e) Write the small program from the previous question using a single line of

code with vector operations.

[2 marks]

(f) Write a MATLAB script that uses a loop to

print

the contents of two vectors

interleaved in to one vector. Assume both vectors are the same length. For

example, if A contains [1, 7, 6, 9], and B contains [4, 4, 2, 5], such that

executing the script should display the following:

>> zip_script

1 4 7 4 6 2 9 5

>>

Hint: Avoid assigning the result in to a vector before printing them.

Explanation / Answer

(a) Write the result of executing the following commands in MATLAB:

X = [1 [[5] [9, -1]] [3]]

Output

X =

1 5 9 -1 3

Y = [1:3; 4 4 4]

Output

Y =

1 2 3
4 4 4

Z = [4:6; 8:10; 15:19]

Output

Error: Dimensions of matrices being concatenated are not consistent.

----------------------------------------------------------------------------------------------------------------------------------------------------

(b) Given the vector Q = [5, 0, 12, 3], write the output after executing each of the following commands:

Q = [Q, 9]

Output

Q =

5 0 12 3 9

Q(2) = []

Output

Q =

5 12 3 9

Q(end-1) = sum(Q)

Output

Q =

5 12 29 9

-----------------------------------------------------------------------------------------------------------------------------------------------------

(c) Given a matrix, M:

1 5 9

7 8 7

3 6 2

Write the values in the matrix after each of the following commands:

M(1,:) = 7

Output

M =

7 7 7
7 8 7
3 6 2

M([3, 1], [2, 3]) = 0

Output

M =

7 0 0
7 8 7
3 0 0

-----------------------------------------------------------------------------------------------------------------------------------------------------

(d) Write equivalent code to the one shown below by replacing the while loop with a for loop

a = [];

x = 5;

while x <= 15

a[x-4] = x^2;

x = x + 1;

end

Ans:

a = [];

for x=5:15
a(x-4) = x^2;
end

------------------------------------------------------------------------------------------------------------------------------------------------------

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