sparse matrix
Technical term in mathematics and computer science for a matrix in which most elements are zero.
このアルゴリズムは疎行列の計算に適している。
This algorithm is suitable for sparse matrix computation.
Compound of 疎 (そ, 'sparse') and 行列 (ぎょうれつ, 'matrix'). The reading そ for 疎 is a standard on'yomi.