例句與造句

1. These decompositions are particularly useful for matrices that are envisioned as concatenations of particular types of row vectors or column vectors, e . g . orthogonal matrices ( whose rows and columns are unit vectors orthogonal to each other ) and Markov matrices ( whose rows or columns sum to 1 ).
2. It's difficult to find markov matrices in a sentence. 用markov matrices造句挺難的