Question

The product y = Ax of an m × n matrix A times a vector x = (x1, x2, . . . , xn) T can be computed row-wise as y = [A(1,:)*x; A(2,:)*x; ... ;A(m,:)*x]; that is y(1) = A(1,:)*x y(2) = A(2,:)*x ... y(m) = A(m,:)*x Write a function M-file that takes as input a matrix A and a vector x, and as output gives the product y = Ax by row, as defined above (Hint: use a for loop to define each entry of the vector y.) Your M-file should perform a check on the dimensions of the input variables A and x and return a message if the dimensions do not match. Call the file myrowproduct.m. Note that this file will NOT be the same as the myproduct.m example. Test your function on a random 3 × 7 matrix A and a random 7 × 1 vector x. Compare the output with A*x. Repeat with a 2 × 6 matrix and a 6 × 1 vector and with a 2 × 6 matrix and a 1 × 6 vector. Use the command rand to generate the random matrices for testing. Include in your lab report the function M-file and the output obtained by running it.

Answer 1

Answer: m × n matrix A times a vector x = (x1, x2, . . . , xn) T can be computed row-wise as ... .m file function y = myrowproduct(A,x) y=[]; [r1 c1]=size(A); [r2 c2]=size(x); if ... The product y Ax of an m x n matrix A times a vector x (ri,z2, ...,zn)T can be ... Repeat with a 3 x 4 matrix and a 4 x 1 vector and with a 3 x 4 matrix and a 1 x ...

Step-by-step explanation: