Define the array A = -4:3 Obtain array x by extracting the first 4 elements of t

Question

Define the array A = -4:3 Obtain array x by extracting the first 4 elements of the array A Obtain array y by extracting the last 4 elements of the array A Obtain array z by stacking arrays x and y horizontally (this should be same as array A) Obtain array T by stacking arrays x and y vertically (x must be on top of y) Change x and y to column vectors and name them as P and Q Obtain array R by stacking arrays x and y horizontally Generate the following array using ones or zeros commands w = 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5

Explanation / Answer

The solutions for the given questions are as follows with the matlab commands followed by their respective outputs and the corresponding matlab code is explained with comments followed by '%':-

A=-4:3; % Array a contains elements from -4 to 3

a) x=A(1:4) % x contains first four elements of array A

output:-

x =

-4 -3 -2 -1

b) y=A(5:8) % y contains last four elements of array A

output:-

y =

0 1 2 3

c) z(1:4)=x; % elements of x are stored in first four positions(indexes) of z

z(5:8)=y; % elements of y are stored in last four positions(indexes) of z

output:-

z =

-4 -3 -2 -1 0 1 2 3

d) T=z' % stacking arrays x and y vertically means transposing z

output:-

T =

-4
-3
-2
-1
0
1
2
3

e)

x=x'; % x is changed to column vector

y=y'; % y is changed to column vector
P=x % column vector x is stored in P
Q=y % column vector y is stored in P

output:-

P =

-4
-3
-2
-1

Q =

0
1
2
3

f) R=[x y] % stacking x and y (column vectors) horizantally

output:-

R =

-4 0
-3 1
-2 2
-1 3

5) w=5*ones(5,3) % ones(5,3) will create a matrix containing all elements as 1 with 5 rows and 3 columns
% 5 * ones(5,3) will multiply each element in the matrix ones(5,3) with 5 thus resulting in % required matrix.
% the resulting matrix will be stored in w

Output:-

w =

5 5 5
5 5 5
5 5 5
5 5 5
5 5 5

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