部分 ぶぶん行列 ぎょうれつじゃなかったです
bubungyōretsujanakattadesu

Noun
Desu Copula

The polite, past negative form of 部分行列

1. Wasn't a partial matrix.; Wasn't part of the matrix.

Past/Perfective
Negative
Polite
Casual Register
Mathematics