Question

Need help with this MatLab exercise. Please show all commands in MatLab.

Enter the following matrices and vectors in MATLAB [ 2 -6 3 ] [ 5 ] -3 A= 2 -7 -2 , B= 2 -2 -3 , b= -13 , c= 3 -1 4], d= 0 [ 7 -2 7 [1 -8 -1 ] [ 10 (a) Perform the following operations: AB, BA, CA and Bd (use standard linear algebra multiplication). - 3 (b) Construct a 6 x 3 matrix C= and a 3 x 4 matrix D = [B d). (c) Use the "backslash" command to solve the system Ax = b. (d) Replace (2, 1)-entry of the matrix A by 0. (e) Extract the 2nd row of the matrix A and store it as a vector a. (f) A row or a column of a matrix can be deleted by assigning the empty vector [] to the row or the column; (for instance A(2,:)=[] deletes the second row of the matrix A). Delete the first column of the matrix B.

Answer 1

Command Window A=[-5 -2 -4;2 -7 -2;7 -2 7] A = -5 -2 -4 7 -2 >> B=[2 -6 3;2 -2 -3;1 -8 -1] 2 -3 -2 -8 >> b=[5;-13;10] >> c=[3 -1 4]

3 -1 4 >> d=(-3;0;-3] ans NO 66 18 -94 >> BA to 32 -35 -28 con 16 fx >> c*A

ans 11 -7 18 >> B*d ans = -15 ) 0 >> C=[A:B] C = ๐ : : : : : ń w won >> D=[B d]

܀ ܀ ܀ ܂ 3 ܀ ܘ ܀

>> X-A\b -5.6099 -1.6241 6.5745 >> A (2,1) =0 A = - - - -

>> 8-A (2,:) 0 -7 -2 >> B(:, 1) =] * * * f& >>