[M] For block operations, it may be necessary to access or enter submatrices of a large...

[M] For block operations, it may be necessary to access or enter submatrices of a large matrix. Describe the functions or commands of your matrix program that accomplish the following tasks. Suppose A is a 20 x 30 matrix.

a. Display the submatrix of A from rows 15 to 20 and columns 5 to 10.

b. Insert a 5 x 10 matrix B into A, beginning at row 10 and column 20.

c. Create a 50 x 50 matrix of the form B =

[Note: It may not be necessary to specify the zero blocks in B.]