Using Matlab

5. With a single MATLAB order, create a random 4 4 matrix of real numbers between -5 and 5. Indication: Run help rand to know how to generate random numbers in uniform distributions (randn is used for normal distributions).

6. With a single MATLAB order, create a random 4 4 matrix of integer numbers between -5 and 5.

7. Consider the following order of MATLAB: A = magic (5). In a single order:

a) Define a matrix B formed by the even rows of matrix A.

b) Define a matrix C formed by the odd columns of matrix A.

c) Define a vector d formed by the third column of matrix A.

d) Remove the third row of matrix A.

8. Let x = (0: pi / 2: 2 * pi). With a single order MATLAB creates a matrix whose first row is x, its second row is the sine of each element of x and whose third row the cosine of each element of x. Build an n n matrix, C = (cij) a) concij = ij, b) with cij = cos (i j).