Issue on page /02_linear_algebra/sparse.html

[alugowski]

Great book! I learned a lot!

One note about this section: https://caam37830.github.io/book/02_linear_algebra/sparse.html#saving-and-loading-sparse-matrices

It says to load a Matrix Market file manually using NumPy's genfromtxt then reconstructing the triplets. It's probably better to introduce scipy.io.mmread which can read this format directly into a coo_matrix.

Note that a .mtx file can have anywhere from 1 to 4 columns (from dense array to coordinate complex) so the genfromtxt approach can be fragile.

For very large matrices I can selfishly recommend the fast_matrix_market package: https://pypi.org/project/fast-matrix-market/