Question

Commands are to be typed in the Command Window in MATLAB [Those preceding the symbol>> are the commands]

• 16.3 Matrix operations

  • >>a=[1 2 3;4 5 6;7 8 9]

  • >>b=[1 0 0;1 0 1;0 0 1]

• Assigning:

  >>a=b(2,:)

• Transposing:

  >>[1;2;3]

  >>[1;2;3]'

• Incrementing:

  >>Tempk=a+273.15

• Scaling:

  >>L=a*2.5

• Adding & subtracting:

  >>[1 2 3;4 5 6]-[8 7 6;4 2 0]

• Repeating:

  >>sqrt(a)

  >>sqrt(b)

• Operating term by term:

• >>[1 3;5 8].*[0 1;4 2]

• >>[1 3;5 8]*[0 1;4 2]

• Creating matrix efficiently

• >>m=[364;297];

• >>n=[3,6,4;2,9,7];

• >>p(1,1)=3;

• >>q=[2:2:200]

• >>r=[1:3:20]

• >>w=[2.5:8.5];

• >>w=[2.5:8.5]

• Advanced Addressing & Matrix operationso

  • >>M=[123;456;789]

  • >>M2=M(2:3,1:3)

  • >>M3=M(2:3,:)

  • >>M4=M(:,1:2)

  • >>c=[A;B]

  • >>A=[1,2;3,4]

  • >>B=[56;78]

  • >>C=[A;B]

  • >>D=[A,B]

Answer 1

The results of the commands when typed on MATLAB command window are provided below:

Please comment if any doubts:

Matrix operations

a=[1 2 3;4 5 6;7 8 9]

b=[1 0 0;1 0 1;0 0 1]

Output:

%Assigning

a=b(2,:)

Output:

%Transposing

[1;2;3]

[1;2;3]'

Output:

%%%Incrementing:

Tempk=a+273.15

OUTPUT:

%%Scaling:

L=a*2.5

Output:

%Adding & subtracting:

[1 2 3;4 5 6]-[8 7 6;4 2 0]

Output:

%%Repeating:

sqrt(a)

sqrt(b)

Output:

%Operating term by term:

[1 3;5 8].*[0 1;4 2]
[1 3;5 8]*[0 1;4 2]

Output:

%%Creating matrix efficiently

m=[364;297];

n=[3,6,4;2,9,7];

p(1,1)=3;

q=[2:2:200]

r=[1:3:20]

w=[2.5:8.5];

w=[2.5:8.5]

Output:

%%Advanced Addressing & Matrix operationso

M=[123;456;789]

%M2=M(2:3,1:3)%%Error , M is a M*1 array

M3=M(2:3,:)

%%M4=M(:,1:2)%%Error , M is a M*1 array

%%c=[A;B]%%Error A and B defined below this line

A=[1,2;3,4]

B=[56;78]

%%C=[A;B] %%%vertical dimensions mismatch (2x2 vs 2x1)

D=[A,B]

Note: This part contains some errors, those are commented above with reason

Output: