please solve in matlab and show us how to caculate

7. Operation on vector and matric. a. Create a horizontal vector cSum which each element is the sum of all elements in each column of the matric cMat (use sum) b. Create a vertical vector cMean which each element is the average of all elements in each row of the matrice Mat (use mean) c. Replace the first row of the matrice Mat with [1 1 11 d. Create Sub, sub-matric of cMat, which contains rows 2 to 8 and columns 3 to 9 e. Create a horizontal vector eVec with 5 elements by using rand. Find all elements which are less than 0.5 and then change them to 0 (use find) f. Create a vector fVec = [1 2 ... 20) (integers from 1 to 20) and then return negative value for all even numbers to get fVec = [1 - 2 3 - 4 ... -20)