Create the function sp_mat2latex which returns in LATEX the sparse CSR and CSC representation of a matrix that is in sparse form.
2nd Exercise
Create the function blkToeplitzTrid(n,B,A,C) which given the matrices A, B, C of size m × m, returns in sparse form the Toeplitz block tridiagonal matrix.
3rd Exercise
Create a function sp_mx2bccs which given a square sparse matrix A and an integer nb (block size), returns the BCCS (block compressed column storage) representation of the above matrix.
4th Exercise
Create a function that takes as an input a matrix in BCCS representation (ie. the arrays val, browidx, bcolptr) with their values) and returns the vector y ← y + Ax
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