Question

using matlab

Create the following matrix B. [18 17 16 15 14 13] 12 11 10 9 8 7 6 5 4 3 2 1 Use the matrix B to: (a) Create a six-element column vector named va that contains the elements of the second and fifth columns of B. (6) Create a seven-element column vector named vb that contains elements 3 through 6 of the third row of B and the elements of the second column of B. Create a nine-element column vector named ve that contains the ele- ments of the second, fourth, and sixth columns of B

Answer 1

Screenshot

%Create a matrix B B-(18 17 16 15 14 13;12 11 10 9 8 7;6 5 4 3 2 1] %Create a column vector with 2nd and 5th column va-[B(:,2).' B(:,5).'] %Create a column vector 2nd column and 3rd rows 3-6 values vb=[B(3, 3:6) B(:,2).'] %Create a column vector of 2,4 and 6th of columns of B Vc=[B(:,2).' B(:,4).' B(:,6).'] 18 12 6 17 11 5 16 10 4 15 9 3 14 8 2 13 7 1 va 17 11 5 14 8 2 vb = 4 3 2 1 17 11 5 Vc = 17 11 5 15 9 3 13 1
Program

%Create a matrix B
B=[18 17 16 15 14 13;12 11 10 9 8 7;6 5 4 3 2 1]
%Create a column vector with 2nd and 5th column
va=[B(:,2).' B(:,5).']
%Create a column vector 2nd column and 3rd rows 3-6 values
vb=[B(3,3:6) B(:,2).']
%Create a column vector of 2,4 and 6th of columns of B
vc=[B(:,2).' B(:,4).' B(:,6).']

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Output

B =

   18   17   16   15   14   13
   12   11   10    9    8    7
    6    5    4    3    2    1

va =

   17   11    5   14    8    2

vb =

    4    3    2    1   17   11    5

vc =

   17   11    5   15    9    3   13    7    1