Question

Write Matlab

Determine the constant of array A after the following statement are executed

A=[4 7 3; 9 12 6; 7 6 9]

i. A([1,3],:)=A([2],:)

ii. C=eye(3,3) b=[1 2 3] C(2,:)=b

Answer 1

A=[4 7 3; 9 12 6; 7 6 9]

I) A([1,3],:)=A([2],:) %produces error because we cannot assign two rows in this manner

Correct statement is : A([1,3],:)= A([2, 2],:) % replace 1 and 3 row with elements in 2nd row

Output:

A =

9 12 6
9 12 6
9 12 6

II)

C = eye(3,3)
b = [1 2 3]
C(2,:)=b %assigning vector v to row 2 of matrix c

Output:

C =

1 0 0
0 1 0
0 0 1

b =

1 2 3

C =

1 0 0
1 2 3
0 0 1