a. Create a vector a with elements from 1 to 100. Store the data of a in a file with filename test.txt.
b. Create a vector b with elements from 100 to 1 and store the data of b in the file test.txt without deleting the data of a.
c. Create a matrix B of size 1 200 and save in B the data of the file test.txt.
d. Save matrix B and vectors a and b in a file matrix.mat and next erase them from the memory.
e. Retrieve only matrix B from the file matrix.mat and load it in the memory.