Take the tour ×  Suppose i have matrix of size 1000*1000 with
70% sparsity. I am performing some multiplication, inverse
operations upon it. While making calculations, does MATLAB make
checks to see if matrix is sparse and perform operations
accordingly(like ignoring multiplications if one of elements is
zero) or do we need to explicitly mention it. What are possible
ways to do so.  Suppose I have sparse matrix A. I want to get
inverse of it. Usually I will use function inv(A). Since matrix
is sparse, I might use following operations  sparse_A =
sparse(A); inv_sparse_A = inv(sparse_A); inv_A =
full(inv_sparse_A); share|improve this question add comment  1
Answer  The inverse of a sparse matrix is usually dense (try
inverting a tridiagonal matrix sometime...), so forget about
hoping that inv(sparse(something)) is sparse. If all you want is
to solve a sparse linear system, it might be better to use lu()
instead (or chol() if the matrix is symmetric positive
definite); it's about as convenient as having an inver