Pharo exercise that manipulates sparse matrices. A sparse matrix is a matrix with most of its elements equal to 0. For example, this is a sparse matrix :
0 0 3 0 4
0 0 5 7 0
0 0 0 0 0
0 2 6 0 0
The goal of this exercise is to change it to a "compact" matrix and vice versa :
Row : 0 0 1 1 3 3
Column : 2 4 2 3 1 2
Value : 3 4 5 7 2 6
It contains 3 methods : createMatrixWithRow: andColumn:, sparseMatrix and unsparseMatrix
Creates a matrix with given rows and columns, or just an empty array if given 0. This matrix will be by default filled with zeros.
Takes a "compact" matrix and return it as a sparse matrix with each value different from 0 at its position and the rest filled with zeros.
Takes a sparse matrix and return it as a 2D array with each value different from 0 and its row and column.