3 ) Given the same matrix m = [ 1 2 3 ; 2 1 5 ; 4 6 4 ; 2 3 2 ] , create matrix n with rows sorted in a descending order of elements in the second column .

1 ) : -   Create a matrix of 3 by 3 with all ones, then Create matrix of 8 by 1 with all zeros , finally Create a matrix of 5 by 2 with all elements equal to 0.37 : -

Code : -

 

clc

clear all

close all

a = ones ( 3 ) ;

b = zeros ( 8 , 1 )

c = ones ( 5 , 2 )

c = c * 0.37

 

Output : -

 

2 ) Create vector “s “containing elements of ‘x’ sorted in an ascending order. Clear x from the workspace. From s create back a vector with the same elements and in the same order as in x .

Code : -

 

clc

clear all

x = [ 2 3 7 1 9 0 ];

s = sort( x )      % ascending order

s = sort(x , 'descend' ) % descending order

[s i] = sort(x) % i represents indexes

 

Output : -

 

3 ) Given the same matrix m = [ 1 2 3 ; 2 1 5 ; 4 6 4 ; 2 3 2 ] , create matrix n with rows sorted in a descending order of elements in the second column .

Code : -

 

clc

clear all

close all

m = [ 1 2 3 ; 2 1 5 ; 4 6 4 ; 2 3 2 ]

n = sortrows ( m , 2 , ('descend') ) %it will sort all row according to their 2nd digit

 

Output : -

 

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